User:Iceblock/Oxford Dictionary of Astronomy
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A
[edit]- Å -> angstrom
- AAO -> Anglo-Australian Observatory
- AAS -> American Astronomical Society
- AAT -> Anglo-Australian Telescope
- AAVSO -> American Association of Variable Star Observers
- A band
- Abell Catalogue
- Abell cluster
- Abell radius
- constant of aberration -> annual aberration
- optical aberration
- aberration of starlight
- ablation
- ablation age
- absolute magnitude
- 1
- 2
- absolute temperature -> thermodynamic temperature
- absolute zero
- absorption
- absorption coefficient
- absorption edge
- absorption line
- absorption nebula -> dark nebula
- absorption spectrum
- abundance -> abundance of elements
- Acamar
- acceleration of free fall
- accretion
- accretion disk
- ACE -> Advanced Composition Explorer
- Achernar
- Achilles
- achondrite
- achromatic
- achromatism
- A-class asteroid
- acronical
- Acrux -> Alpha Crucis
- active galactic nucleus
- active optics
- active prominence
- active region
- John Couch Adams
- Walter Sydney Adams
- Adams Ring
- adaptive optics
- Adhara
- adiabatic process
- Adonis
- Adrastea (moon)
- ADS -> Aitken Double Star Catalogue
- Advanced Composition Explorer
- ACE
- advance of perihelion
- advection
- aeon
- aerial -> antenna
- aerobraking
- aerolite -> stony meteorite
- aeronomy
- aerosol
- Ae star
- aether -> ether
- afocal
- afterglow
- AGB star -> asymptotic giant branch star
- Agena -> Hadar -> Beta Centauri
- agglutinate
- AGILE
- AGK
- AGN -> active galactic nucleus
- Ahnighito meteorite -> Cape York meteorite
- airglow
- airmass
- air shower -> cosmic-ray shower
- George Biddell Airy
- Airy disk
- Robert Grant Aitken
- Aitken Double Star Catalogue
- AI Velorum star
- AJ -> Astronomical Journal
- Akari
- Albategnius -> al-Battani
- al-Battani -> Battani
- albedo
- albedo feature
- Albireo
- Alcor
- Alcyone
- Aldebaran
- Alderamin
- Alexandra family
- ALEXIS
- Hannes Olof Gösta Alfvén
- Alfvén surface
- Alfvén wave
- Algenib
- Algieba
- Algol
- Algol star
- Algonquin Radio Observatory
- Alhena
- aliasing
- alidade
- Alioth
- Alkaid
- Allegheny Observatory
- Allende meteorite
- Allen Telescope Array
- all-sky camera
- ALMA -> Atacama Large Millimeter Array
- Almaak
- Almagest
- almanac
- almucantar
- Alnair
- Alnath
- Alnilam
- Alnitak
- α -> right ascension
- Alpha Capricornid meteors
- Alpha Centauri
- Alpha Crucis
- Alpha Cygnid meteors
- Alpha Cygni star
- alpha particle
- Alphard
- Alpha Scorpiid meteors
- Alpha2 Canum Venaticorum star
- Alphekka
- Alpheratz
- Alrescha
- Alshain
- al-Sufi -> Sufi
- Altair
- altazimuth mounting
- altitude
- al-Tusi -> Tusi
- aluminizing
- Amalthea
- Viktor Amazaspovich Ambartsumian
- ambipolar diffusion
- AM Canum Venaticorum star
- American Association of Variable Star Observers
- American Astronomical Society
- Ames Research Center
- AM Herculis star
- Amor group
- amplitude
- 1
- 2
- Am star
- anaemic spiral galaxy
- analemma
- Ananke
- anastigmatic
- Anaxagoras
- Anaximander
- Andromeda
- Andromeda Galaxy
- Andromedid meteors
- Anglo-Australian Observatory
- Anglo-Australian Telescope
- Anders Jonas Ångström
- angstrom
- angular acceleration
- angular diameter
- angular distance -> angular separation
- angular momentum
- angular resolution
- angular separation
- angular velocity
- anisotropy
- Ankaa
- annealing
- annual aberration
- annual equation
- annual inequality -> annual equation
- annual parallax
- annual variation
- annular eclipse
- anomalistic month
- anomalistic year
- anomalous Cepheid
- anomalous iron
- anomaly
- anorthosite
- ANS -> Astronomical Netherlands Satellite
- ansa
- ansae
- antapex -> solar apex
- Antares
- antenna
- Antennae
- antenna pattern
- antenna temperature
- anthelion
- anthelion radiant
- anthropic principle
- anticentre -> galactic anticentre
- anti-dwarf nova
- antimatter
- antitail
- Antlia
- Eugène Michael Antoniadi
- Antoniadi scale
- Antu
- ap-
- apo-
- Apache Point Observatory
- apastron
- aperture
- aperture efficiency
- aperture ratio
- aperture synthesis
- APEX -> Atacama Pathfinder Experiment
- apex -> solar apex
- aphelion
- Aphrodite Terra
- ApJ -> Astrophysical Journal
- aplanatic
- apoapsis
- apocentre
- apochromatic
- apodization
- apogee
- apohele
- Apollo group
- Apollonius of Perga
- Apollo project
- apparent diameter -> angular diameter
- apparent magnitude
- apparent noon
- apparent place
- apparent retrogression
- apparent sidereal time
- apparent solar time
- apparition
- appulse
- apse -> apsides
- apsis -> apsides
- apsidal motion
- apsides
- Ap star
- Apus
- Aquarid meteors
- Aquarius
- aqueous alteration
- Aquila
- Ara
- arachnoid
- François Arago
- Dominique François Jean Arago
- Arago ring
- arc
- archaeoastronomy
- arch filament system
- arc minute -> minute of arc
- arcmin -> minute of arc
- arc second -> second of arc
- arcsec -> second of arc
- Arcturus
- arcus
- area photometer
- Arecibo Observatory
- Comet Arend–Roland (C/1956 R1)
- areo-
- Friedrich Wilhelm August Argelander
- Argelander step method
- Argo Navis
- argon–potassium method -> potassium–argon method
- argument of perihelion
- Argyre Planitia
- Ariel
- Ariel satellites
- Aries
- first point of Aries
- Aristarchos Telescope
- Aristarchus of Samos
- Aristotle
- Arizona meteor crater -> meteor crater
- Arizona Radio Observatory
- ARO
- AR Lacertae star
- armillary sphere
- arm population
- Arneb
- array
- 1
- 2
- artificial satellite
- ASCA
- ascending node
- Asclepius
- ashen light
- ASP -> Astronomical Society of the Pacific
- aspect
- aspheric
- stellar association
- Association of Universities for Research in Astronomy
- AURA
- A star
- asterism
- asteroid
- asteroid belt
- asteroseismology
- asthenosphere
- astigmatism
- Astraea
- astration
- astrobiology
- astrobleme
- astrochemistry
- astrodynamics
- astrograph
- Astrographic Catalogue
- astrolabe
- astrology
- astrometric binary
- astrometry
- astronavigation
- Astronomer Royal
- Astronomer Royal for Scotland
- The Astronomical Almanac
- Astronomical Journal
- AJ
- Astronomical Netherlands Satellite
- ANS
- Astronomical Society of the Pacific
- ASP
- astronomical triangle
- astronomical twilight
- astronomical unit
- AU
- astronomy
- Astronomy and Astrophysics
- A&A -> Astronomy and Astrophysics
- astrophotography
- Astrophysical Journal
- astrophysics
- ASTROSAT
- astrum
- Asuka -> ASCA
- asymptotic giant branch star
- AGB star
- Atacama Large Millimeter Array
- ALMA
- Atacama Pathfinder Experiment
- APEX
- ataxite
- Aten group
- Atlas
- atmosphere
- atmospheric extinction
- atmospheric refraction
- atmospheric scattering -> atmospheric extinction -> Mie scattering -> Rayleigh scattering
- atmospheric window
- ATNF -> Australia Telescope National Facility
- atom
- atomic clock
- atomic time
- Atria
- attenuation
- 1
- 2
- AU -> astronomical unit
- aubrite
- Auger shower -> cosmic-ray shower
- augmentation
- AURA -> Association of Universities for Research in Astronomy
- Auriga
- Aurora programme
- aurora
- auroral oval
- auroral substorm -> substorm
- Australia Telescope National Facility
- ATNF
- australite
- autocorrelation
- autocorrelator
- autoguider
- autoionization
- autumnal equinox -> equinox
- averted vision
- Avior
- axion
- optical axis
- axis of rotation
- azimuth
- Azophi -> al-Sufi
B
[edit]- BAA -> British Astronomical Association
- Wilhelm Heinrich Walter Baade
- Walter Baade
- Baade's Window
- Baade–Wesselink method
- Harold Delos Babcock
- Horace Welcome Babcock
- background noise
- background radiation
- backscattering
- Bailey type
- Francis Baily
- Baily's beads
- Baker–Schmidt telescope
- Baldwin effect
- Balmer limit
- Balmer lines -> Balmer series
- Balmer series
- band
- bandpass filter
- bandwidth
- bar
- barium star
- Barlow lens
- Edward Emerson Barnard
- Barnard's Loop
- Barnard's Star
- barn-door mount -> Scotch mount
- Barnes–Evans relationship
- barred spiral galaxy
- barrel distortion
- Barringer Crater -> meteor crater
- barycentre
- Barycentric Celestial Reference System
- barycentric coordinates
- Barycentric Coordinate Time
- Barycentric Dynamical Time
- baryon
- baryon star
- basalt
- basaltic achondrite
- baseline
- impact basin
- Muammad ibn Jabir al-Battani
- Ba II star -> barium star
- Bautz–Morgan class
- Johann Bayer
- Bayer letters
- B band
- B-class asteroid
- BCRS -> Barycentric Celestial Reference System
- BD -> Bonner Durchmusterung
- Beagle
- beam
- beaming
- beamwidth
- beat Cepheid
- Becklin–Neugebauer Object (BN Object)
- Becrux -> Beta Crucis
- bediasite
- Beehive Cluster -> Praesepe
- Belinda
- Bellatrix
- Susan Jocelyn Bell Burnell
- Jocelyn Bell Burnell
- Belt of Orion
- Benetnasch -> Alkaid
- Comet Bennett (C/1969 Y1)
- bent-pillar mounting
- BepiColombo
- BeppoSAX
- Berkeley–Illinois–Maryland Association Array (BIMA Array)
- Friedrich Wilhelm Bessel
- Besselian day numbers
- Besselian elements
- Besselian epoch
- Besselian year
- Be star
- B(e) star
- Beta Canis Majoris star -> Beta Cephei star
- Beta Cephei star
- Beta Crucis
- beta decay
- Beta Lyrae star
- beta particle
- Beta Persei star -> Algol star
- Beta Pictoris
- Beta Regio
- Beta Taurid meteors
- Betelgeuse
- Hans Albrecht Bethe
- Bethe–Weizsäcker cycle -> carbon–nitrogen cycle
- Bianca
- Bianchi cosmology
- biconcave lens
- biconvex lens
- Comet 3D/Biela
- Bielid meteors -> Andromedid meteors
- Big Bang theory
- Big Bear Solar Observatory
- Big Crunch
- Big Dipper
- billitonite
- BIMA Array
- binary galaxy
- binary pulsar
- binary star
- binding energy
- binoculars
- Jean-Baptiste Biot
- bipolar group
- bipolar nebula
- bipolar outflow
- birefringent filter
- Birmingham Solar Oscillations Network
- BiSON -> Birmingham Solar Oscillations Network
- black body
- black-body radiation
- black drop
- black dwarf
- Black Eye Galaxy
- black hole
- Black Widow Pulsar -> binary pulsar
- blazar
- Blaze Star
- Blazhko effect
- BL Herculis star
- blink comparator
- Blinking Planetary
- BL Lacertae object
- BL Lac object
- bloomed lens
- blooming
- 1
- 2
- blue clearing
- blue compact dwarf galaxy
- blue giant
- blue Moon
- 1
- 2
- Blue Planetary
- blue populous cluster -> Large Magellanic Cloud
- blueshift
- blue straggler
- B magnitude
- BN Object -> Becklin–Neugebauer Object
- Johann Elert Bode
- Bode's law
- Bartholomeus Jan Bok
- Bartholomeus 'Bart' Jan Bok
- Bok globule -> globule
- bolide
- bolometer
- bolometric correction
- bolometric magnitude
- Boltzmann constant
- George Phillips Bond
- William Cranch Bond
- Bond albedo
- Hermann Bondi
- Bonner Durchmusterung
- Boötes
- boson
- Boss General Catalogue
- GC
- boundary layer
- bound–bound transition
- bound–free transition
- Bouwers telescope
- Ira Sprague Bowen
- Bowen fluorescence
- bow shock
- Bp star
- Brackett series
- James Bradley
- Bragg crystal spectrometer
- Tycho Brahe
- Brans–Dicke theory
- breccia
- bremsstrahlung
- bridge (astronomy)
- bright nebula
- brightness temperature
- Bright Star Catalogue
- British Astronomical Association
- broad-band photometry
- Brocchi's Cluster
- Comet 16P/Brooks 2 -> Jupiter comet family
- Ernest William Brown
- brown dwarf
- B star
- Bubble Nebula
- Budrosa family
- Bug Nebula
- bump Cepheid
- Geoffrey Ronald Burbidge
- Eleanor Margaret Burbidge
- burst (astronomy)
- Butcher–Oemler effect
- Butler matrix
- Butterfly Cluster
- butterfly diagram
- Butterfly Nebula
- BV photometry
- Bw star
- BY Draconis star
- Byurakan Astrophysical Observatory
C
[edit]- Caelum
- Calar Alto Observatory
- caldera
- calendar
- calendar year
- Caliban
- California Nebula
- Callippus
- Callisto
- Caloris Basin
- Caltech Submillimeter Observatory
- CSO
- Calypso (moon)
- Cambridge Optical Aperture Synthesis Telescope
- COAST
- Camelopardalis
- William Wallace Campbell
- Canada–France–Hawaii Telescope
- canale
- canali
- Martian canals
- Cancer
- Tropic of Cancer
- Canes Venatici
- Canis Major
- Canis Minor
- Annie Jump Cannon
- Canopus
- cantaloupe terrain
- Capella
- Cape Photographic Durchmusterung
- Cape photometry
- Cape RI photometry -> Kron–Cousins RI photometry
- Cape York meteorite
- Caph
- Tropic of Capricorn
- Capricornid meteors
- Capricornus
- captured rotation -> synchronous rotation
- Carafe Galaxy
- carbonaceous chondrite
- carbon burning
- carbon cycle -> carbon–nitrogen cycle
- carbon flash
- carbon–nitrogen cycle (CN cycle)
- carbon star
- Carina
- Carina Arm
- Carina Dwarf Galaxy
- Carina–Sagittarius Arm
- CARMA -> Combined Array for Research in Millimeter-wave Astronomy
- Carme
- Carnegie Observatories
- Carpo
- Richard Christopher Carrington
- Carrington heliographic coordinates
- Carrington rotation
- Carte du Ciel
- Cartesian coordinates
- Cartwheel Galaxy
- Cassegrain telescope
- Cassini
- Giovanni Domenico Cassini
- Jacques Cassini
- Cassini Division
- Cassini–Huygens
- Cassiopeia
- Cassiopeia A
- Castalia
- Castor
- cataclysmic binary
- cataclysmic variable
- catadioptric system
- Catalina Sky Survey
- catalogue equinox
- catena
- catoptric system
- Cat's Eye Nebula
- cavus
- CCD -> charge-coupled device
- CCD spectrometer
- C-class asteroid
- cD Galaxy
- CDM -> cold dark matter
- CDS -> Centre de Données astronomiques de Strasbourg
- celestial axis
- celestial coordinates
- celestial equator
- Celestial Intermediate Reference System
- celestial latitude
- celestial longitude
- celestial mechanics
- celestial meridian
- celestial pole
- celestial sphere
- Centaur group
- Centaurus
- Centaurus A
- Center for Astrophysics
- Central Bureau for Astronomical Telegrams
- central meridian
- central peak
- Centre de Données astronomiques de Strasbourg
- centre of gravity
- centre of inertia
- centre of mass
- centrifugal force
- centripetal force
- Cepheid instability strip
- Cepheid variable
- Cepheus
- Cerenkov counter
- Cerenkov radiation
- Ceres
- Cerro Pachón
- Cerro Paranal
- Cerro Tololo Inter-American Observatory
- Cetus
- CfA -> Harvard–Smithsonian Center for Astrophysics
- CGRO -> Compton Gamma Ray Observatory
- Chamaeleon
- Chandler period
- Chandler wobble
- Subrahmanyan Chandrasekhar
- Chandrasekhar limit
- Chandrasekhar-Schönberg limit
- Chandra X-ray Observatory
- Chandrayaan-1
- Chang'e
- chaos
- chaotic orbit
- chaotic terrain
- CHARA Array
- charge
- charge-coupled device
- Charon
- chasma
- chassignite
- chemical element
- chemosphere
- Chicxulub
- CHIPSat
- Chiron
- Ernst Florens Friedrich Chladni
- chondrite
- chondrule
- chopper
- chopping secondary
- William Henry Mahoney Christie
- chromatic aberration
- chromosphere
- chromospheric network
- Chryse Planitia
- CH star
- Circinus
- Circlet
- circular velocity
- circumpolar
- circumstellar maser
- circumstellar matter
- Cirrus Nebula -> Veil Nebula
- CIRS -> Celestial Intermediate Reference System
- cislunar
- civil time
- civil twilight
- civil year
- Alexis Claude Clairaut
- Alvan Clark
- classical Cepheid
- clast
- clathrate
- CLEAN
- Clementine
- James Clerk Maxwell
- C line
- clock drive -> drive
- clock star
- closed universe
- Clown Face Nebula -> Eskimo Nebula
- Cluster
- star cluster -> globular cluster
- star cluster -> open cluster
- cluster, star -> star cluster
- cluster of galaxies
- cluster variable -> RR Lyrae star
- CMB -> cosmic microwave background
- CME -> coronal mass ejection
- CM relation -> colour–magnitude relation
- CN band
- CN cycle -> carbon–nitrogen cycle
- CNO cycle -> carbon–nitrogen–oxygen cycle
- CN star
- Coalsack
- coaltitude
- COAST
- Coathanger
- COBE
- Cocoon Nebula
- cocoon star
- CoD -> Córdoba Durchmusterung
- coded mask
- coelostat
- coesite
- coherence
- coherence bandwidth
- colatitude
- cold camera
- cold dark matter
- collapsar
- colles
- collimation
- collimation error
- collimator
- Colombo Gap
- colorimetry -> colour index
- colour -> colour index
- colour excess
- colour index
- colour–luminosity relation -> colour–magnitude relation
- colour–magnitude relation
- colour temperature
- Columba
- column density
- colure
- cometary coma
- optical coma
- Coma Berenices
- Coma Cluster
- Coma Star Cluster
- Coma–Virgo Cluster -> Virgo Cluster
- Combined Array for Research in Millimeter-wave Astronomy
- combined magnitude
- comes
- comet
- cometary globule
- comet family
- comet-seeker
- commensurability
- Andrew Ainslie Common
- common envelope binary
- common proper motion
- compact galaxy
- compact object
- compact source
- comparator
- comparison spectrum
- composite-spectrum binary
- Compton effect
- Compton Gamma Ray Observatory
- Compton–Getting effect
- Compton scattering -> Compton effect
- Compton upscattering -> inverse Compton scattering
- Concordia family
- Cone Nebula
- confusion
- conic section
- conjunction
- constant of aberration -> annual aberration
- constellation
- constructive interference -> interference
- contact binary
- continuous creation
- continuous spectrum
- continuum
- stellar convection
- convective envelope
- convective equilibrium
- convective overshoot -> overshooting
- convective zone
- convergent point
- converging lens
- convolution
- Thomas Cooke
- cooled camera -> cold camera
- cooling flow
- coorbital
- Coordinated Universal Time
- coordinate systems -> celestial coordinates
- coordinate time
- Copernican system
- Nicolaus Copernicus
- Copernicus satellite
- Coprates
- Cor Caroli
- Cordelia
- Córdoba Durchmusterung
- planetary core
- stellar core
- core collapse
- 1
- 2
- Coriolis force
- corona
- 1
- 2
- 3
- Corona Australis
- Corona Borealis
- coronagraph
- coronal bright point
- coronal condensation
- coronal hole
- coronal lines
- coronal loop
- coronal mass ejection
- coronal plume
- coronal rain
- COROT
- co-rotation
- corpuscular radiation
- 1
- 2
- corrector plate
- correlation detection
- correlation function
- correlation receiver
- correlator
- Corvus
- COS-B
- cosmic abundance
- Cosmic Background Explorer
- cosmic background radiation -> cosmic microwave background
- CBR -> cosmic background radiation
- cosmic censorship
- cosmic dust
- cosmic microwave background
- cosmic rays
- cosmic-ray shower
- cosmic scale factor
- cosmic string
- cosmic texture
- cosmic year
- cosmochemistry -> astrochemistry
- cosmological constant
- cosmological distance scale
- cosmological principle
- cosmology
- cosmos
- Cosmos satellites
- COSPAR
- coudé focus
- Couder telescope
- counterglow -> gegenschein
- Philip Herbert Cowell
- c.p.m. -> common proper motion
- Crab Nebula
- Crab Pulsar
- Crater
- crater
- crater chain
- crater counting
- crêpe ring
- crepuscular rays
- crescent
- Cressida
- Crimean Astrophysical Observatory
- critical density
- Andrew Claude de la Cherois Crommelin
- cross-axis mounting
- crossing time
- cross-wire micrometer
- crown glass
- crust
- Crux
- cryostat
- cryovolcanism
- C star
- CTIO -> Cerro Tololo Inter-American Observatory
- Cubewano
- culmination
- curvature of field
- curvature of space -> curvature of spacetime
- curvature of spacetime
- curvature radiation
- curve of growth
- cusp
- cusp gap
- Cybele group
- cyclotron maser
- cyclotron radiation
- Cygnus
- Cygnus A
- Cygnus Loop
- Cygnus Rift
- Cygnus X-1
- Cynthian
- Cytherean
D
[edit]- Dactyl
- Dall–Kirkham telescope
- Damocles
- Damocloid
- André Danjon
- Danjon astrolabe
- Danjon scale
- dark adaptation
- dark energy
- dark galaxy
- dark matter
- dark nebula
- daughter isotope
- Davida
- David Dunlap Observatory
- Raymond Davis, Jr
- William Rutter Dawes
- Dawes limit
- Dawn
- day
- Daylight Saving Time -> Summer Time
- day number
- 1
- 2
- D-class asteroid
- DCT -> Discovery Channel Telescope
- DDO classification
- DDO photometry
- dec. -> declination
- deceleration parameter
- Comet de Chéseaux (C/1743 X1)
- declination
- declination axis
- deconvolution
- decoupling
- dedispersion
- Deep Impact
- deep-sky object
- Deep Space Network
- Deep Space 1
- defect of illumination
- deferent
- deflection of light
- degeneracy
- degenerate star
- degree of arc
- degrees of freedom
- Deimos
- delay line
- Delphinus
- δ -> declination
- delta -> declination
- Delta Aquarid meteors
- Delta Cepheid star -> classical Cepheid
- Delta Delphini star
- Delta Scuti star
- delta T
- ΔT
- Demon Star
- Deneb
- Deneb Kaitos
- Denebola
- William Frederick Denning
- density parameter
- density wave
- descending node
- Desdemona
- Willem de Sitter
- de Sitter universe
- Despina
- destructive interference -> interference
- detached binary
- deuterium
- Gérard Henri de Vaucouleurs
- dewar
- dew cap
- D galaxy
- diagonal
- diamond ring
- Diana Chasma
- dichotomy
- dichroic mirror
- Robert Henry Dicke
- Dicke radiometer
- Dicke switch
- dielectronic recombination
- differential rotation
- differentiation
- diffraction
- diffraction grating
- diffraction-limited
- diffraction pattern
- diffraction rings
- diffuse interstellar bands
- diffuse nebula
- diogenite
- Dione
- dioptric system
- Diphda -> Deneb Kaitos
- dipole
- 1
- 2
- 3
- dipole antenna
- Dirac cosmology
- directivity
- direct motion
- dirty snowball
- disconnection event
- Discovery Channel Telescope
- Discovery Program
- dish antennae
- disk galaxy
- disk population
- disparition brusque -> filament
- dispersion
- 1
- 2
- dispersion measure
- distance modulus
- distortion
- diurnal
- diurnal aberration
- diurnal inequality
- diurnal libration
- diurnal motion
- diurnal parallax
- diverging lens
- D layer
- D lines
- dMe star
- Dobsonian telescope
- Dog Star
- John Dollond
- domain wall
- dome
- Dominion Astrophysical Observatory
- Dominion Radio Astrophysical Observatory
- Comet Donati (C/1858 L1)
- Christian Johann Doppler
- Doppler broadening
- Doppler effect -> Doppler shift
- dopplergram
- Doppler shift
- Dorado
- dorsum
- Double Cluster
- Double Double
- double-lined binary
- double-mode variable
- double pulsar
- double quasar
- double star
- doublet
- 1
- 2
- DQ Herculis star
- Draco
- draconic month
- Draconid meteors -> Giacobinid meteors
- Drake equation
- Henry Draper
- Draper
- drawtube
- Johan Ludvig Emil Dreyer
- drifting sub-pulse
- drift scan
- drive
- D star
- Dubhe
- Dumbbell Nebula
- dust
- dust tail -> cometary tail
- duty cycle
- dwarf Cepheid
- dwarf galaxy
- dwarf nova
- dwarf planet
- dwarf spheroidal galaxy
- dwarf star
- dwarf variable
- Dwingeloo galaxy
- Dwingeloo Radio Observatory
- dynamical equinox
- dynamical friction
- dynamical parallax
- dynamical time
- dynamo
- Frank Watson Dyson
E
[edit]- Eagle Nebula
- early-type galaxy
- early-type star
- Earth
- Earth coorbital asteroid -> Apollo group -> Aten group
- Earth-crossing asteroid -> Amor group
- Earth-approaching asteroid
- earthlight -> earthshine
- eccentric anomaly
- eccentricity
- echelle grating
- echelle spectrograph
- E-class asteroid
- eclipse
- eclipse season
- eclipse year
- eclipsing binary
- ecliptic
- ecliptic coordinates
- ecliptic latitude
- ecliptic limits
- ecliptic longitude
- ecliptic pole
- E corona
- Arthur Stanley Eddington
- Eddington limit
- Edgeworth–Kuiper Belt -> Kuiper Belt
- E-ELT -> European Extremely Large Telescope
- effective aperture
- effective area
- effective focal length
- effective temperature
- Effelsberg Radio Observatory
- Egg Nebula
- Albert Einstein
- Einstein coefficient
- Einstein Cross
- Einstein–de Sitter universe
- Einstein Observatory
- Einstein ring
- Einstein shift -> gravitational redshift
- ejecta
- Elara
- E layer
- electromagnetic radiation
- electromagnetic spectrum
- electron
- electron degeneracy
- electron density
- electron scattering opacity
- electron temperature
- electronvolt
- chemical element
- optical element
- elementary particle
- abundance of elements
- orbital elements
- E line
- Ellerman bomb
- ellipse
- ellipsoid
- ellipsoidal variable
- elliptic aberration -> E-terms
- elliptical galaxy
- ellipticity -> oblateness
- Elnath -> Alnath
- elongation
- 1
- 2
- Eltanin -> Etamin
- Elysium Planitia
- emersion
- emission
- emission line
- emission nebula
- emission spectrum
- emissivity
- photographic emulsion
- Enceladus
- Comet 2P/Encke
- Johann Franz Encke
- Encke Division
- energy level
- English mounting
- Enif
- Ensisheim meteorite
- enstatite chondrite
- entrainment
- entropy
- envelope (astronomy)
- eon -> aeon
- Eos family
- epact
- Ep galaxy
- ephemeris
- Ephemeris Time
- epicycle
- Epimetheus
- epoch
- e-process
- Epsilon Aurigae
- equant
- equation (astronomy)
- equation of light
- equation of the centre
- equation of the equinoxes
- equation of the origins
- equation of time
- equator
- equatorial bulge
- equatorial coordinates
- equatorial horizontal parallax
- equatorial mounting
- equinoctial colure
- equinox
- equipotential surface
- equivalence principle
- equivalent focal length
- equivalent width
- Equuleus
- ERA -> Earth rotation angle
- Eratosthenes
- Erfle eyepiece
- ergosphere
- Eridanus
- Eris
- Eros
- eruptive binary
- eruptive prominence
- eruptive variable
- ESA -> European Space Agency
- escape velocity
- Eskimo Nebula
- ESO -> European Southern Observatory
- ET -> Ephemeris Time
- Eta Aquarid meteors
- Eta Carinae
- Eta Carinae Nebula
- etalon
- Etamin
- E-terms
- ether
- eucrite
- Eudoxus of Cnidus
- Leonhard Euler
- Eunomia family
- Europa
- European Extremely Large Telescope
- European Southern Observatory
- European Space Agency
- European VLBI Network
- EUV -> extreme ultraviolet
- EUVE -> Extreme Ultraviolet Explorer
- eV -> electronvolt
- evection
- evening star
- event horizon
- Evershed effect
- EVN -> European VLBI Network
- evolved star
- excitation
- excitation temperature
- exit cone
- exit pupil
- EX Lupi star
- exobiology -> astrobiology
- ExoMars
- exoplanet -> extrasolar planet
- EXor -> EX Lupi star
- Exosat
- exosphere
- expanding universe
- Explorer
- exposure age
- extended source
- 1
- 2
- atmospheric extinction
- interstellar extinction
- extragalactic nebula -> galaxy
- extrasolar planet
- extreme Population I star
- extreme ultraviolet
- Extreme Ultraviolet Explorer
- extrinsic variable
- eye lens
- eyepiece
- eye relief
F
[edit]- Faber–Jackson relation
- David Fabricius
- Johann Fabricius
- Johannes Fabricius
- Fabry lens
- Fabry–Perot interferometer
- facula
- 1
- 2
- fall
- falling star -> meteor
- False Cross
- Fanaroff–Riley class
- fan beam
- Faraday effect
- far infrared
- farrum
- far ultraviolet
- Far Ultraviolet Spectroscopic Explorer
- Fast Auroral Snapshot Explorer
- fast nova
- Faulkes Telescopes
- fault
- F band
- F-class asteroid
- F corona
- feed
- fermion
- fibrille
- field curvature -> curvature of field
- field equations
- field flattener
- field lens
- field of view
- field star
- field stop
- 53 Persei star
- figure
- filament
- 1
- 2
- filamentary nebula
- filar micrometer
- filigree
- filled aperture
- filled-centre supernova remnant -> plerion
- filter
- 1
- 2
- filtergram
- find
- finder
- fine structure
- fireball
- first contact
- first point of Aries
- first point of Libra
- first quarter
- Fish Mouth
- fission
- fission track
- Fitzgerald contraction -> Lorentz–Fitzgerald contraction
- fixed stars
- FK
- FK Comae Berenices star
- John Flamsteed
- Flamsteed numbers
- solar flare
- flare star
- flash spectrum
- flash star
- flat
- polar flattening
- F layer
- Williamina Paton Fleming
- flexus
- flickering
- flint glass
- flocculi
- 1 -> mottles
- 2 -> plages
- Flora group
- fluctus
- flumen
- fluorescence
- fluorite
- flux
- flux collector
- flux density
- 1
- 2
- flux tube
- flux unit
- f/number
- focal distance
- focal length
- focal plane
- focal point
- focal ratio
- focal reducer
- focal surface
- optical focus
- orbital focus
- Fokker–Planck equation
- folded dipole
- following
- Fomalhaut
- footpoint -> coronal loop
- forbidden line
- Forbush effect
- fork mounting
- Fornax
- Fornax A
- Fornax Dwarf Galaxy
- 47 Tucanae
- forward scattering
- fossa
- Foucault test
- four-colour photometry -> Strömgren photometry
- Fourier analysis
- Fourier transform
- Fourier transform spectrometer
- fourth contact
- William Alfred Fowler
- Fp star
- fractional method
- frame dragging
- frame of reference
- Franklin-Adams charts
- Joseph von Fraunhofer
- Fraunhofer lines
- Fred Lawrence Whipple Observatory
- free–bound transition
- free–free transition
- frequency
- frequency analysis -> Fourier analysis
- Friedmann universe
- fringe -> interference pattern
- fringe pattern
- f-spot
- F star
- FTS -> Fourier transform spectroscopy
- full Moon
- full-wave dipole
- full width at half maximum
- fundamental catalogue
- fundamental mode
- fundamental plane
- fundamental star
- fuor -> FU Orionis star
- FUSE -> Far Ultraviolet Spectroscopic Explorer
- fusion
- fusion crust
- future light cone -> light cone
- FWHM -> full width at half maximum
G
[edit]- g -> acceleration of free fall
- G -> gravitational constant
- Gacrux -> Gamma Crucis
- Gaia
- gain
- galactic anticentre
- galactic bulge
- galactic centre
- galactic cluster
- galactic coordinates
- galactic disk
- galactic equator
- galactic halo
- galactic latitude
- galactic longitude
- galactic magnetic field
- galactic nucleus
- galactic plane
- galactic pole
- galactic rotation
- galactic window
- galactic year -> cosmic year
- Galatea
- Galaxy
- galaxy
- galaxy cannibalism
- galaxy cluster
- galaxy encounter
- galaxy evolution
- Galaxy Evolution Explorer
- galaxy formation
- galaxy merger
- GALEX -> Galaxy Evolution Explorer
- Galilean satellites
- Galilean telescope
- Galileo
- Galileo Galilei
- Galileo National Telescope
- Galileo Regio
- Johann Gottfried Galle
- Galle Ring
- Gamma Cassiopeiae star
- Gamma Crucis
- Gamma Doradus star
- gamma-ray astronomy
- gamma-ray background
- gamma-ray burst
- Gamma-ray Large Area Space Telescope
- gamma rays
- gamma-ray telescope
- George Gamow
- Ganymede
- Sergei Illarionovich Gaposchkin -> Cecilia Payne-Gaposchkin
- Garnet Star
- gas giant -> giant planet
- Gaspra
- gas scintillation proportional counter
- gas tail -> cometary tail
- Carl Friedrich Gauss
- Gaussian gravitational constant
- G band
- G-class asteroid
- GCRS -> Geocentric Celestial Reference System
- GCVS -> General Catalogue of Variable Stars
- gegenschein
- Geminga
- Gemini
- Geminid meteors
- Gemini Observatory
- Gemma -> Alphekka
- General Catalogue of Variable Stars
- general precession
- general theory of relativity
- Genesis
- Geneva photometry
- geo-
- geocentric
- Geocentric Celestial Reference System
- geocentric coordinates
- Geocentric Coordinate Time
- geocentric equatorial parallax
- geocentric parallax
- geocorona
- geodesic
- geodesy
- Geographos
- geoid
- geomagnetic storm
- geomagnetism
- geometrical albedo
- geometrical libration -> optical libration
- georgiaite
- geostationary orbit
- geosynchronous orbit
- geotail -> magnetotail
- germanium detector
- German mounting
- GHA
- ghost crater
- Ghost of Jupiter
- Riccardo Giacconi
- Giacobinid meteors
- Comet 21P/Giacobini–Zinner
- giant branch
- Giant Magellan Telescope
- Giant Metrewave Radio Telescope
- giant molecular cloud
- giant planet
- giant star
- gibbous
- Gienah
- David Gill
- Ginga
- Giotto
- GLAST -> Gamma-ray Large Area Space Telescope
- Glauke
- glitch
- Global Oscillation Network Group
- globular cluster
- globule
- GMAT -> Greenwich Mean Astronomical Time
- GMC -> giant molecular cloud
- GMST -> Greenwich Mean Sidereal Time
- GMT -> Greenwich Mean Time
- GMT -> Giant Magellan Telescope
- gnomon
- Goddard Space Flight Center
- Gödel universe
- Thomas Gold
- Goldstone
- GONG -> Global Oscillation Network Group
- John Goodricke
- GoTo telescope
- Benjamin Apthorp Gould
- Gould's Belt
- graben
- interplanetary grains
- interstellar grains
- Granat
- grand unified theory
- Gran Telescopio Canarias
- granulation
- graticule -> reticle
- grating -> diffraction grating
- grating spectrometer
- gravitation
- gravitational acceleration
- gravitational collapse
- gravitational constant
- gravitational deflection
- gravitational energy
- gravitational field
- gravitational force
- gravitational instability
- gravitational lens
- gravitational mass
- gravitational radiation
- gravitational wave
- graviton
- gravity assist
- gravity gradient
- Gravity Probe B
- grazing-incidence telescope
- grazing occultation
- GRB -> gamma-ray burst
- Great Attractor
- Great Bear -> Ursa Major
- great circle
- Great Dark Spot
- greatest brilliancy
- greatest elongation
- Great Observatories
- Great Red Spot
- Great Rift
- Great September Comet (C/1882 R1)
- Great Wall
- Green Bank
- Green Bank Telescope
- green flash
- greenhouse effect
- Greenwich hour angle
- Greenwich Mean Astronomical Time
- Greenwich Mean Sidereal Time
- Greenwich Mean Time
- Greenwich meridian
- Greenwich Observatory
- Greenwich sidereal date
- Greenwich Sidereal Time
- Gregorian calendar
- Gregorian telescope
- James Gregory
- Comet 26P/Grigg–Skjellerup
- grism
- grooved terrain
- Grotrian diagram
- ground state
- GRS -> Great Red Spot
- Howard Grubb
- Grus
- GST -> Greenwich Sidereal Time
- G star
- GTC -> Gran Telescopio Canarias
- Guardians
- guest star
- guider
- guide star
- guide telescope
- Gum Nebula
- GUT -> grand unified theory
- GW Virginis star -> ZZ Ceti star
- gyrofrequency
- gyrosynchrotron radiation
H
[edit]- HA -> hour angle
- Hadar
- Hadley circulation
- Hadley Rille
- hadron
- hadron era
- HAEBE -> Herbig Ae/Be star
- Haedi -> Kids
- Haig mount -> Scotch mount
- Hakucho
- halation
- HALCA
- George Ellery Hale
- Comet Hale–Bopp (C/1995 01)
- Hale Observatories
- Hale's law -> bipolar group
- Hale telescope
- half-life
- half-wave dipole
- half-width -> full width at half maximum
- Asaph Hall
- Edmond Halley
- Halley-family comet
- Halley's Comet
- atmospheric halo
- galactic halo
- halo CME
- halo orbit
- halo population
- Hα
- Hamal
- H and K lines
- Hanle effect
- hard X-rays
- Haro galaxy
- Hartebeesthoek Radio Astronomy Observatory
- HartRAO -> Hartebeesthoek Radio Astronomy Observatory
- Hartmann test
- Haruka -> HALCA
- Harvard classification
- Harvard College Observatory
- Harvard Revised Photometry
- Harvard–Smithsonian Center for Astrophysics
- harvest Moon
- Hat Creek Radio Observatory
- Hathor
- Haute-Provence Observatory
- Stephen William Hawking
- Hawking radiation
- Hayabusa
- Hayashi track
- Haystack Observatory
- HCG -> Hickson compact group
- HD Catalogue -> Henry Draper Catalogue
- cometary head
- head–tail galaxy
- HEAO -> High Energy Astrophysical Observatory
- heat death of the Universe
- Heaviside layer -> E layer
- heavy element
- heavy-metal star
- Hebe
- Hektor
- Helene
- heli- -> Sun
- helio- -> Sun
- heliacal rising and setting
- heliocentric
- 1
- 2
- heliocentric coordinates
- heliocentric latitude
- heliocentric longitude
- heliocentric parallax -> annular parallax
- heliographic coordinates
- heliometer
- heliopause
- helioseismology
- heliosheath
- heliosphere
- Helios probes
- heliostat
- helium burning
- helium flash
- helium shell flash
- helium star
- Helix Nebula
- Hellas Planitia
- helmet streamer -> streamer
- Helmholtz–Kelvin contraction
- hemispherical albedo
- Henry Draper Catalogue
- Henyey track
- Hephaistos
- Heraclides of Pontus
- Herbig Ae/Be star
- Herbig–Haro object
- Hercules
- Hercules Cluster
- Hercules X-1
- Herculina
- Hermes
- Caroline Lucretia Herschel
- Karoline Lucretia Herschel -> Caroline Lucretia Herschel
- John Frederick William Herschel
- Frederick William Herschel -> William Herschel
- Friedrich Wilhelm Herschel -> William Herschel
- William Herschel
- Herschelian telescope
- Comet 35P/Herschel–Rigollet
- Herschel Space Observatory
- Hertha family -> Nysa family
- hertz
- Ejnar Hertzsprung
- Hertzsprung gap
- Hertzsprung–Russell diagram
- Victor Francis Hess
- HESSI -> Ramaty High-energy Solar Spectroscopic Imager
- HETE-2 -> High Energy Transient Explorer-2
- Johannes Hevelius
- Antony Hewish
- hexahedrite
- HH object -> Herbig–Haro object
- Hickson compact group
- Hidalgo
- hierarchical cosmology
- High Energy Astrophysical Observatory
- high-energy astrophysics
- High-Energy Transient Explorer-2
- lunar highlands
- high-speed photometry
- high-velocity cloud
- high-velocity star
- Hilda group
- George William Hill
- Himalia
- Hind's Crimson Star
- Hind's Variable Nebula
- Hinode
- Hinotori
- Hipparchus of Nicaea
- Hipparcos
- Hirayama family
- Hiten
- H line -> H and K lines
- H magnitude
- Hoba West meteorite
- Hobby–Eberly Telescope
- Hohmann orbit
- Holmberg radius
- homogeneity
- homology
- Homunculus Nebula
- H I region
- Hooker Telescope
- horizon
- horizontal branch
- horizontal coordinates
- horizontal parallax
- horizontal refraction
- horn antenna
- Horologium
- Jeremiah Horrocks
- Jeremiah Horrox -> Jeremiah Horrocks
- Horsehead Nebula
- horseshoe mounting
- Horseshoe Nebula
- horseshoe orbit
- horst
- hot Big Bang
- hot dark matter
- hot Jupiter
- hot spot
- 1
- 2
- hour angle
- hour circle
- Hourglass Nebula
- howardite
- Fred Hoyle
- HPBW -> half-power beamwidth
- half-power beamwidth -> beamwidth
- HR diagram -> Hertzsprung–Russell diagram
- HR number
- HSO -> Herschel Space Observatory
- HST -> Hubble Space Telescope
- H20 maser
- H II region
- Edwin Powell Hubble
- Hubble classification
- Hubble constant
- Hubble diagram
- Hubble flow
- Hubble law
- Hubble parameter -> Hubble constant
- Hubble radius
- Hubble–Sandage variable
- Hubble Space Telescope
- Hubble's Variable Nebula
- Hubble time
- William Huggins
- Hendrik ('Henk') Christoffel van de Hulst
- Milton Lasell Humason
- hummocky terrain
- Humphreys series
- Hungaria group
- hunter's Moon
- Huygenian eyepiece
- Christiaan Huygens
- Huygens Gap
- Huygens probe
- Hyades
- Comet Hyakutake (C/1996 B2)
- Hydra
- hydrocarbon
- hydrogen
- hydrogen burning
- hydrogen emission region
- hydrogen ion
- hydrogen line -> 21-centimetre line
- hydrogen spectrum
- hydrostatic equilibrium
- hydroxyl
- Hydrus
- Hygiea
- hyperbola
- hyperbolic comet
- hyperbolic orbit
- hyperbolic velocity
- hyperboloid
- hyperfine structure
- hypergiant star
- Hyperion
- hypernova
- hyperon
- hypersensitization
- hypersthene achondrite -> diogenite
- hypervelocity impact
- Hz -> hertz
- HZ43
I
[edit]- Iapetus
- IAU -> International Astronomical Union
- IC -> Index Catalogue
- Icarus
- ICE -> International Cometary Explorer
- ICRF -> International Celestial Reference Frame
- ICRS -> International Celestial Reference System
- Ida
- IGM -> intergalactic medium
- igneous
- IGY -> International Geophysical Year
- Comet Ikeya–Seki (C/1965 S1)
- Comet Ikeya–Zhang (153P/)
- illuminance
- IMAGE -> Imager for Magnetopause-to-Aurora Global Exploration
- image intensifier -> image tube
- Image Photon Counting System
- Imager for Magnetopause-to-Aurora Global Exploration
- image tube
- imaging photometer -> area photometer
- I magnitude
- Imbrium Basin
- immersion
- impact crater
- impactite
- impersonal astrolabe -> Danjon astrolabe
- inclination
- 1
- 2
- Index Catalogue
- indochinite
- Indus
- inequality
- inert gas -> noble gas
- inertial coordinate system
- inertial mass
- inertial reference frame
- infall velocity
- inferior conjunction
- inferior planet
- inflationary universe
- Infrared Astronomical Satellite
- infrared astronomy
- infrared cirrus
- infrared excess
- infrared photometry
- infrared radiation
- infrared source
- Infrared Space Observatory
- infrared telescope
- infrared window
- initial mass function
- Robert Thorburn Ayton Innes
- Innisfree meteorite
- insolation
- instability strip
- Institut de Radio Astronomie Millimétrique
- INT -> Isaac Newton Telescope
- INTEGRAL -> International Gamma-Ray Astrophysics Laboratory
- integrated magnitude
- integration time
- intensity
- intensity interferometer
- interacting binary
- interacting galaxy
- Interamnia
- interference
- 1
- 2
- interference filter
- interference pattern
- interferometer
- intergalactic absorption
- intergalactic magnetic field
- intergalactic medium
- intermediate-band photometry
- intermediate-population star
- intermediate-type star
- International Astronomical Union
- International Atomic Time
- International Celestial Reference Frame
- International Celestial Reference System
- International Cometary Explorer
- International Date Line
- International Gamma-Ray Astrophysics Laboratory
- International Geophysical Year
- International Sun–Earth Explorer
- International Sunspot Number
- International Ultraviolet Explorer
- International Years of the Quiet Sun
- interplanetary matter
- interplanetary scintillation
- interpulse
- interstellar absorption
- interstellar maser
- interstellar matter
- interstellar molecule
- interstellar reddening -> interstellar absorption
- interstellar scintillation
- interstellar wind
- intrinsic colour index
- intrinsic variable
- invariable plane
- inverse Compton effect
- inverse Compton scattering -> inverse Compton effect
- inverse P Cygni profile -> P Cygni profile
- inverse-square law
- inversion layer -> atmospheric transparency
- Io (moon)
- iodine cell
- ion
- ionization
- ionization equilibrium
- ionization front
- ionization potential
- ionization temperature
- ionopause
- ionosphere
- ionospheric scintillation
- ion tail -> cometary tail
- Iota Aquarid meteors
- IPCS -> Image Photon Counting System
- IQSY -> International Years of the Quiet Sun
- IR -> infrared
- IRAM -> Institut de Radio Astronomie Millimétrique
- IRAS -> Infrared Astronomical Satellite
- Comet IRAS–Araki–Alcock (C/1983 H1)
- Iris (asteroid)
- iron meteorite
- iron peak
- irradiance
- irradiation
- 1
- 2
- irregular galaxy
- irregular variable
- IRTF -> NASA Infrared Telescope Facility
- Isaac Newton Group
- Isaac Newton Telescope
- ISEE -> International Sun–Earth Explorer
- Ishtar Terra
- ISM -> interstellar matter -> interstellar medium
- ISO (observatory) -> Infrared Space Observatory
- isochron
- isochrone
- isophotal wavelength
- isophote
- isotherm
- isothermal process
- isothermal region
- isotope
- isotropy
- IUE -> International Ultraviolet Explorer
- Izar
J
[edit]- James Clerk Maxwell Telescope
- James Webb Space Telescope
- jansky
- Karl Guthe Jansky
- (Pierre) Jules César Janssen
- Janus (moon)
- JCMT -> James Clerk Maxwell Telescope
- JD -> Julian Date
- James Hopwood Jeans
- Jeans length
- Jeans mass
- jet (astronomical objects)
- Jet Propulsion Laboratory
- Jewel Box
- Jilin meteorite
- J magnitude
- Job's Coffin
- Jodrell Bank Observatory
- Johnson photometry
- Johnson Space Center
- Joint Astronomy Centre
- Harold Spencer Jones
- joule
- Jovian planet
- JPL -> Jet Propulsion Laboratory
- Julian calendar
- Julian Date
- Julian day number
- Julian epoch
- Juliet (moon)
- Juno (asteroid)
- Jupiter (planet)
- Jupiter–family comet
- JWST -> James Webb Space Telescope
K
[edit]- K -> kelvin scale
- Immanuel Kant
- Kappa Crucis Cluster -> Jewel Box cluster
- Kappa Cygnid meteors
- kappa mechanism
- Jacobus Cornelius Kapteyn
- Kapteyn Selected Areas
- Kapteyn's Star
- Kaus Australis
- K corona
- K-correction
- Keck Telescopes
- Keeler Gap
- Kellner eyepiece
- Lord (William Thomson) Kelvin
- Kelvin–Helmholtz contraction -> Helmholtz–Kelvin contraction
- kelvin scale
- Kennedy Space Center
- Kepler (satellite)
- Johannes Kepler
- Johann Kepler -> Johannes Kepler
- Keplerian telescope
- Kepler's equation
- Kepler's laws
- Kepler's Star
- Kerr black hole
- Keyhole Nebula
- Keystone
- Kids (asterism)
- kinematic parallax
- kinetic energy
- kinetic temperature
- Gustav Robert Kirchhoff
- Kirchhoff's laws
- Kirin meteorite -> Jilin meteorite
- Daniel Kirkwood
- Kirkwood gaps
- Kitt Peak National Observatory
- Kleinmann–Low Nebula
- KL Nebula -> Kleinmann–Low Nebula
- K line -> H and K lines
- K magnitude
- knife-edge test -> Foucault test
- Kochab
- Comet Kohoutek (C/1973 E1)
- König eyepiece -> Erfle eyepiece
- Koronis family
- KPNO -> Kitt Peak National Observatory
- Kracht group
- Kramers opacity
- KREEP
- Kreutz sungrazer
- Kron–Cousins RI photometry
- Kruskal diagram
- K star
- Kueyen
- Gerard Peter Kuiper
- Kuiper Airborne Observatory
- Kuiper Belt
L
[edit]- labes
- labyrinthus
- Nicolas Louis de Lacaille
- Lacerta
- Lacertid -> BL Lacertae object
- lacus
- Lagoon Nebula
- Joseph Louis de Lagrange(-Tournier)
- Lagrangian point
- l'Aigle meteorite shower
- Joseph Jérôme (Le Français) de Lalande
- Lalande 21185
- Lambda Boötis star
- Lambda Eridani star
- La Palma -> Roque de los Muchachos Observatory
- Pierre Simon de Laplace
- Laplacian plane
- Large Binocular Telescope
- Large Magellanic Cloud
- Large Millimeter Telescope
- large-scale structure
- Large Synoptic Survey Telescope
- Larissa
- Las Campanas Observatory
- laser
- Laser Interferometer Space Antenna
- La Silla Observatory
- William Lassell
- Lassell ring
- last contact
- last quarter
- La Superba
- late heavy bombardment
- late-type galaxy
- late-type star
- latitude
- latitude variation
- LBV -> luminous blue variable
- L dwarf
- leap second
- leap year
- least circle of confusion -> astigmatism -> spherical aberration
- Henrietta Swan Leavitt
- Leda (moon)
- Georges Édouard Lemaître
- Lemaître universe
- lens
- Lense–Thirring effect -> frame dragging
- gravitational lens
- lenticula
- lenticular galaxy
- Leo (constellation)
- Leo Minor (constellation)
- Leonid meteors
- lepton
- lepton era
- Lepus
- Leto family
- Urbain Jean Joseph Le Verrier <-> Urbain Jean Joseph Leverrier
- Le Verrier Ring
- Comet Lexell (D/1770 L1)
- LHA -> local hour angle
- Libra (constellation)
- first point of Libra
- libration
- libration point -> Lagrangian point
- Lick Observatory
- light
- speed of light
- light bucket -> flux collector
- light cone
- light-curve
- light pollution
- light pressure -> radiation pressure
- light time
- light year
- limb
- limb brightening
- limb darkening
- limiting magnitude
- 1
- 2
- Lincoln Near-Earth Asteroid Research
- Bertil Lindblad
- Lindblad resonance
- linea
- LINEAR
- line blanketing
- line broadening
- line of apsides
- line of inversion -> magnetic inversion line
- line of nodes
- line profile
- liner
- line ratio
- line receiver
- line spectrum
- linewidth
- line wing
- lingula
- LISA -> Laser Interferometer Space Antenna
- LISA Pathfinder
- Lissajous orbit
- lithium star
- lithosiderite -> stony-iron meteorite
- lithosphere
- Little Dipper
- Little Dumbbell
- Liverpool Telescope
- L magnitude
- LMC -> Large Magellanic Cloud
- LMT -> Large Millimeter Telescope
- lobate ridge
- lobate scarp
- lobe
- 1
- 2
- local arm
- local bubble
- Local Group
- local hour angle
- local mean time
- local sidereal time
- local standard of rest
- local supercluster
- local thermodynamic equilibrium
- local time
- Lockman hole
- (Joseph) Norman Lockyer
- lodranite
- LOFAR -> Low Frequency Array
- LONEOS -> Lowell Observatory Near-Earth Object Search
- long-baseline interferometry
- longitude
- longitude at the epoch
- longitude of perigee
- longitude of perihelion
- longitude of the ascending node
- long-period comet
- long-period variable
- lookback time
- loop prominence
- Lorentz–Fitzgerald contraction
- Lorentz transformation
- Lost City meteorite
- (Alfred Charles) Bernard Lovell
- Lovell Telescope
- Percival Lowell
- Lowell Observatory
- Lowell Observatory Near-Earth Object Search
- lower culmination
- Low Frequency Array
- low-luminosity star
- low-mass star
- low surface brightness galaxy
- low-velocity star
- LRO -> Lunar Reconnaissance Orbiter
- LSR -> local standard of rest
- LSST -> Large Synoptic Survey Telescope
- LST -> local sidereal time
- LTP -> lunar transient phenomenon
- luminosity
- luminosity class
- luminosity evolution -> galaxy evolution
- luminosity function
- luminosity–volume test
- luminous arc
- luminous blue variable
- Luna (Moon probes)
- lunar eclipse
- lunar inequality
- Lunar Module
- Lunar Orbiter
- lunar parallax
- Lunar Prospector
- Lunar Reconnaissance Orbiter
- lunar theory -> lunar inequality
- lunar transient phenomenon
- lunation
- Knut Emil Lundmark
- lunisolar precession
- lunitidal interval
- Lunokhod
- Lupus
- Lutz–Kelker bias
- Willem ('William') Jacob Luyten
- l.y. -> light year
- Lydia family
- Lyman-α forest
- Lyman-break Galaxy
- Lyman limit
- Lyman series
- Lynx (constellation)
- Bernard Ferdinand Lyot
- Lyot filter -> birefringent filter
- Lyra (constellation)
- Lyrid meteors
- Lysithea
M
[edit]- m -> apparent magnitude
- M -> Messier Catalogue
- M -> absolute magnitude
- MACHO
- Mach's principle
- macrospicules
- macroturbulence
- macula
- Maffei Galaxies
- Magdalena Ridge Observatory
- Magellan
- Magellanic Clouds
- Magellanic Stream
- Magellan Telescopes
- magma
- magnetar
- magnetic inversion line
- magnetic monopole
- magnetic star
- magnetic storm -> geomagnetic storm
- magnetic variable
- magnetobremsstrahlung
- magnetogram
- magnetohydrodynamics
- magnetopause
- magnetosheath
- magnetosphere
- magnetotail
- magnification
- magnitude
- magnitude of an eclipse
- main beam
- main-belt asteroid -> asteroid belt
- main lobe -> main beam
- main sequence
- major axis
- Maksutov telescope
- Malin-1
- Malmquist bias
- manganese–mercury star -> mercury–manganese star
- manganese star
- mantle
- many-body problem -> n-body problem
- mare (astronomy)
- Maria family
- Mariner
- Mariner Valley -> Valles Marineris
- Markab
- Markarian galaxy
- Mars (planet)
- Marsden group
- Mars Exploration Rover
- Mars Express
- Mars Global Surveyor
- Marshall Space Flight Center
- Mars Odyssey (2001 Mars Odyssey)
- Mars Pathfinder
- Mars probes
- Mars Reconnaissance Orbiter
- mascon
- maser
- maser amplifier
- maser source
- Nevil Maskelyne
- mass
- mass defect
- mass discrepancy
- mass function
- mass loss
- mass–luminosity relation
- mass–radius relation
- mass ratio
- mass-to-light ratio
- mass transfer
- John Cromwell Mather
- matter era
- Mauna Kea Observatories
- (Edward) Walter Maunder
- Maunder minimum
- maximum-entropy method
- James Clerk Maxwell
- Maxwell Gap
- Maxwell Montes
- Maxwell Telescope -> James Clerk Maxwell Telescope
- Mayall Telescope
- McDonald Observatory
- McIntosh scheme -> sunspot
- M-class asteroid
- McMath–Pierce Solar Telescope
- MDM Observatory
- mean anomaly
- mean daily motion
- mean density of matter
- mean equator
- mean equinox
- mean motion
- mean parallax -> statistical parallax
- mean place
- mean pole
- mean position -> mean place
- mean sidereal time
- mean solar day
- mean solar time
- mean sun
- mean time
- medium-band photometry
- megamaser
- megaregolith
- Megrez
- Melipal
- meniscus lens
- meniscus Schmidt telescope
- Menkalinan
- Menkar
- Mensa (constellation)
- mensa (planets)
- Donald Howard Menzel
- Merak
- Mercury
- mercury-manganese star
- Mercury Surface, Space Environment, Geochemistry, and Ranging
- celestial meridian
- terrestrial meridian
- meridian angle
- meridian astronomy
- meridian circle
- meridian passage -> meridian transit
- meridian telescope -> meridian circle -> transit circle -> transit instrument
- meridian transit
- MERLIN -> Multi-Element Radio-Linked Interferometer Network
- meson
- mesopause
- mesosiderite
- mesosphere
- MESSENGER -> Mercury Surface, Space Environment, Geochemistry, and Ranging
- Charles Joseph Messier
- Messier Catalogue
- Me star
- metagalaxy
- metal
- metallic hydrogen
- metal-poor star
- metal-rich star
- metastable state
- meteor
- Meteor Crater
- meteorite
- meteoroid
- meteor shower
- meteor storm
- meteor stream
- meteor swarm
- methanol maser
- Metis
- Metonic cycle
- Meudon Observatory
- Meyer group
- MHD -> magnetohydrodynamics
- Miaplacidus
- Mice (galaxies)
- Albert Abraham Michelson
- Michelson interferometer
- Michelson–Morley experiment
- Michelson stellar interferometer -> stellar interferometer
- microchannel plate detector
- microdensitometer
- microlensing
- micrometeorite
- micrometer (measuring instrument)
- micrometre
- micron
- micropore optics
- Microscopium (constellation)
- microturbulence
- Microvariability and Oscillations of Stars
- microvariable
- microwave background radiation
- microwaves
- Midcourse Space Experiment
- Mie scattering
- Milky Way
- millimetre-wave astronomy
- millimetre waves
- millisecond pulsar
- Mills cross
- Edward Arthur Milne
- Milne–Eddington approximation
- Mimas (moon)
- Mimosa -> Beta Crucis
- Hermann Minkowski
- Rudolph Leo Bernhard Minkowski
- minor axis
- minor planet -> asteroid
- Minor Planet Center
- Mintaka
- minute
- minute of arc <-> arcmin
- Mira
- Mirach
- Miranda (moon)
- Mira star
- Mirphak
- mirror
- mirror blank
- Mirzam
- missing mass
- Maria Mitchell
- Mittenzwey eyepiece
- mixing ratio
- Mizar
- MJD -> Modified Julian Date
- MK classification -> Morgan–Keenan classification
- MKK classification -> Morgan–Keenan classification
- M magnitude
- MMT Observatory
- mock Moon -> parselene
- mock Sun -> parhelion
- Modified Julian Date
- moldavite
- molecular cloud
- molecular hydrogen
- molecular line
- molecule
- Molonglo Radio Observatory
- moment of inertia
- MONET -> Monitoring Network of Telescopes
- Monitoring Network of Telescopes
- monocentric eyepiece
- Monoceros (constellation)
- monochromatic light
- monochromatic magnitude
- monochromator
- Monogem Ring
- monopole -> magnetic monopole
- mons (planets)
- month
- Monthly Notices of the Royal Astronomical Society
- Mont Mégantic Observatory -> Observatoire du Mont-Mégantic
- Moon
- Mopra Observatory
- Moreton wave
- William Wilson Morgan
- Morgan–Keenan classification
- Morgan's classification
- morning star
- MOST -> Microvariability and Oscillations of Stars
- mottles
- Mount Graham International Observatory
- mounting
- Mount Palomar Observatory -> Palomar Observatory
- Mount Stromlo and Siding Spring Observatories
- Mount Wilson classification -> sunspot
- Mount Wilson Observatory
- moustache -> Ellerman bomb
- moving cluster
- MRAO -> Mullard Radio Astronomy Observatory
- M region
- MRO -> Magdalena Ridge Observatory
- MSSSO -> Mount Stromlo and Siding Spring Observatories
- MS star
- 1
- 2
- M star
- MSX -> Midcourse Space Experiment
- Mu Cephei star
- Mullard Radio Astronomy Observatory
- Johann Müller -> Regiomontanus
- multi-beam receiver
- Multi-Element Radio-Linked Interferometer Network
- multiple star
- multiplet
- multi-ringed basin -> impact basin
- multiverse
- muon
- mural circle
- Musca (constellation)
N
[edit]- nadir
- Nagler eyepiece
- Naiad
- Nal detector
- naked eye
- naked singularity
- nakhlite
- Nançay Radio Astronomy Observatory
- nanometre
- Naos
- narrow-band photometry
- NASA -> National Aeronautics and Space Administration
- NASA Infrared Telescope Facility
- Nasir Eddin -> al-Tusi
- Nasser Eddin -> al-Tusi
- Nasmyth focus
- National Aeronautics and Space Administration
- National Astronomy and Ionosphere Center -> Arecibo Observatory
- National Optical Astronomy Observatory
- National Radio Astronomy Observatory
- National Solar Observatory
- National Space Science Data Center
- The Nautical Almanac
- nautical twilight
- n-body problem
- NEA -> near-Earth asteroid
- neap tide
- near-Earth asteroid
- Near-Earth Asteroid Tracking
- near infrared
- NEAR Shoemaker
- near ultraviolet
- NEAT -> Near-Earth Asteroid Tracking
- nebula
- nebula filter
- nebular line
- nebular variable
- nebulosity
- negative eyepiece
- negative lens -> diverging lens
- Neptune (planet)
- Nereid (moon)
- Neumann lines
- neutral hydrogen
- neutral hydrogen line -> 21-centimetre line
- neutral point
- neutrino
- neutrino astronomy
- neutron
- neutron degeneracy
- neutron star
- Simon Newcomb
- New General Catalogue
- New Horizons
- New Millennium Program
- new Moon
- New Style date
- New Technology Telescope
- newton
- Isaac Newton
- Newtonian–Cassegrain telescope
- Newtonian focus
- Newtonian telescope
- Newton's law of gravitation
- Newton's laws of motion
- N galaxy
- NGC -> New General Catalogue
- nickel–iron meteorite -> iron meteorite
- Nicol prism
- nightglow -> airglow
- night sky brightness
- night vision
- Nix Olympica -> Olympus Mons
- NLC -> noctilucent clouds
- nm -> nanometre
- N magnitude
- NOAO -> National Optical Astronomy Observatory
- Nobeyama Radio Observatory
- noble gas
- noctilucent clouds
- nocturnal
- nodal line
- node
- nodical month -> draconic month
- non-baryonic matter
- non-gravitational force
- non-radial pulsation
- non-thermal radiation
- Nordic Optical Telescope
- Norma (constellation)
- normal astrograph
- North America Nebula
- Northern Coalsack -> Great Rift
- Northern Cross -> Cygnus (constellation)
- northern lights -> aurora (astronomy)
- North Galactic Spur
- north polar distance
- North Polar Sequence
- North Star -> Polaris
- nova
- nova-like variable
- NPD -> north polar distance
- NRAO -> National Radio Astronomy Observatory
- NS -> New Style date
- NSO -> National Solar Observatory
- NSSDC -> National Space Science Data Center
- N star -> carbon star
- NTT -> New Technology Telescope
- Nubecula Major -> Magellanic Clouds
- Nubecula Minor -> Magellanic Clouds
- nuclear fusion
- nuclear reaction
- nuclear time-scale
- nucleon
- nucleosynthesis
- atomic nucleus
- cometary nucleus
- galactic nucleus
- null geodesic
- number evolution -> galaxy evolution
- Nunki
- nutation
- nutation in right ascension -> equation of the equinoxes
- Nysa family
O
[edit]- OAO -> Orbiting Astronomical Observatory
- OB association
- Oberon
- object glass
- objective
- objective grating
- objective prism
- oblateness
- oblate spheroid -> spheroid
- oblique rotator
- obliquity of the ecliptic
- Observatoire du mont Mégantic
- observatory
- occultation
- occulting bar
- occulting disk
- oceanus
- OC star
- octahedrite
- Octans (constellation)
- ocular -> eyepiece
- Oe star
- off-axis guider
- Of star
- o.g. -> object glass
- OH–IR source
- OH line
- OH maser
- OHP -> Haute-Provence Observatory
- Heinrich Wilhelm Matthäus Olbers
- Olbers' paradox
- Old Style date
- Oljato (asteroid)
- Olympus Mons
- O magnitude
- Omega Centauri
- Omega Nebula
- Onsala Space Observatory
- ON star
- Jan Hendrik Oort
- Oort Cloud
- Oort's constants
- Oosterhoff group
- Ootacamund Radio Astronomy Centre
- opacity
- open cluster
- open universe
- Ophelia (moon)
- Ophiuchid meteors
- Ophiuchus (constellation)
- Ernst Julius Öpik
- Oppenheimer–Volkoff limit
- Opportunity (Mars rover)
- opposition (astronomy)
- opposition effect
- optical axis
- optical depth
- optical double
- optical flat
- optical glass
- optical interferometer
- optical libration
- optical pathlength
- optical pulsar
- optical thickness -> optical depth
- optical wedge
- optics
- orbit
- orbital elements
- orbital velocity
- Orbiting Astronomical Observatory
- Orbiting Solar Observatory
- ordinary chondrite
- organic molecule
- Orgueil meteorite
- Orientale Basin
- Orion (constellation)
- Orion Arm
- Orion Association
- Orionid meteors
- Orion Molecular Clouds
- Orion Nebula
- Orion Spur
- Orion variable
- ORM -> Roque de los Muchachos Observatory
- orrery
- orthoscopic eyepiece
- OS -> Old Style date
- oscillating universe
- osculating elements
- osculating orbit
- OSO -> Orbiting Solar Observatory
- O star
- OT -> Teide Observatory
- outgassing
- 1
- 2
- overcontact binary
- oversampling
- overshooting
- overtone mode
- OVV quasar -> optically violently variable quasar -> blazar
- Owens Valley Radio Observatory
- Owl Nebula
- oxygen burning
- ozonosphere
P
[edit]- PA -> position angle
- PAH -> polycyclic aromatic hydrocarbon
- pair annihilation
- pair production
- palimpsest
- Pallas (asteroid)
- pallasite
- Palomar Observatory
- Palomar Observatory Sky Survey
- palus
- Pan (moon)
- Pandora (moon)
- Pan-STARRS
- parabola
- parabolic antenna
- parabolic comet
- parabolic orbit
- parabolic velocity
- paraboloid
- parallactic angle
- parallactic ellipse
- parallactic inequality
- parallactic motion
- parallax
- parametric amplifier
- Paranal Observatory
- paraxial
- parent isotope
- parfocal
- parhelion
- Paris Observatory
- Parkes Observatory
- parsec
- parselene
- William Parsons -> Third Earl of Rosse
- partial eclipse
- particle -> elementary particle
- pascal (unit)
- Paschen–Back effect
- Paschen series
- Pasiphae (moon)
- passband
- past light cone -> light cone
- patera
- pathlength -> optical pathlength
- Paul Wild Observatory
- Pavo (constellation)
- Cecilia Helena Payne-Gaposchkin
- pc -> parsec
- P-class asteroid
- P Cygni line profile
- P Cygni star -> S Doradus star
- Peacock (star)
- peculiar galaxy
- peculiar motion
- peculiar star
- peculiar velocity
- pedestal crater
- Peekskill meteorite
- Pegasus (constellation)
- Pele
- Pelican Nebula
- Penrose process
- penumbra
- 1
- 2
- penumbral eclipse
- Arno Allan Penzias
- perfect cosmological principle
- peri-
- periapsis
- periastron
- periastron effect
- pericentre
- perigee
- perihelion
- time of perihelion passage
- orbital period
- period–age relation
- period–colour relation
- period–density relation
- periodic comet
- periodic orbit
- periodic perturbation
- period–luminosity–colour relation
- period–luminosity relation
- period–mass relation
- period–radius relation
- period–spectrum relation
- Perseid meteors
- Perseus (constellation)
- Perseus A
- Perseus Arm
- Perseus Cluster
- personal equation
- perturbation
- Petzval surface
- Pfund series
- PHA -> Potentially Hazardous Asteroid
- Phad
- Phaethon (asteroid)
- phase
- 1
- 2
- phase angle
- phased array
- phase defect
- phase diagram
- phase difference
- phase rotator
- phase-switching interferometer
- phase transition -> inflationary universe
- Phecda -> Phad
- Pherkad
- Phillips bands
- Phobos (moon)
- Phobos probes
- Phocaea group
- Phoebe (moon)
- Phoenicid meteors
- Phoenix (constellation)
- Phoenix (Mars lander)
- Pholus (asteroid)
- photino
- photocathode
- photocell -> photoelectric cell
- photocentre
- 1
- 2
- photoconductive cell
- photodissociation
- photodissociation region
- photoelectric cell
- photoelectric magnitude
- photoelectric photometer
- photographic amplification
- photographic emulsion
- photographic magnitude
- photographic zenith tube
- photoheliograph
- photoionization
- photometer
- photometric binary
- photometric parallax
- photometric standard -> standard star
- photometry
- photomultiplier
- photon
- photon sphere
- photopolarimeter -> polarimeter
- photosphere
- photovisual magnitude
- photovoltaic detector
- physical albedo -> geometrical albedo
- physical double
- physical libration
- Giuseppe Piazzi
- Pic du Midi Observatory
- Edward Charles Pickering
- William Henry Pickering
- Pickering Series
- Pico Veleta
- Pictor (constellation)
- pincushion distortion
- Pinwheel Galaxy
- pion
- Pioneer
- Pioneer Venus
- Pipe Nebula
- Pisces (constellation)
- Piscid meteors
- Piscis Austrinid meteors
- Piscis Austrinus (constellation)
- pitch angle
- pixel
- plage
- Planck (spacecraft)
- Planck constant
- Planck era
- Planck's law
- planemo
- planet
- planetarium
- planetary aberration
- planetary aspect -> aspect
- planetary migration
- planetary nebula
- planetary precession
- planetesimal
- planetoid -> asteroid -> Giuseppe Piazzi
- planetology
- planisphere
- planitia
- planoconcave lens
- planoconvex lens
- planum
- John Stanley Plaskett
- Plaskett's Star
- plasma
- plasmapause
- plasmasphere
- plasma tail -> cometary tail
- Plateau de Bure
- plate centre
- plate constants
- plate-measuring machine
- plate scale
- plate tectonics
- Platonic year
- PLC relation -> period–luminosity–colour relation
- Pleiades
- plerion
- Plössl eyepiece
- Plough (asterism)
- PL relation -> period–luminosity relation
- plume
- 1
- 2
- Plutino
- Pluto
- P magnitude
- Pockels cell
- Norman Robert Pogson
- Pogson ratio
- Pogson scale
- Pogson step method
- (Jules) Henri Poincaré
- Pointers
- point source
- point-spread function
- polar -> AM Herculis star -> DQ Herculis star
- polar axis
- polar cap
- polar diagram
- polar distance
- polar flattening
- polarimeter
- polarimetry -> polarization
- Polaris
- polarization
- polar motion
- polar orbit
- polar plume -> coronal plume
- polar ring galaxy
- polar sequence
- polar wandering
- pole
- pole star
- Pollux
- polycyclic aromatic hydrocarbon
- John Pond
- Jean Louis Pons
- stellar population
- Population I
- Population II
- Population III
- pore
- Porrima
- Porro prism
- Portia (moon)
- positional astronomy -> astrometry -> meridian astronomy
- position angle
- position-angle effect
- position circle
- position micrometer -> filar micrometer
- positive lens -> converging lens
- POSS -> Palomar Observatory Sky Survey
- post-nova
- potassium–argon method
- potential hazardous asteroid
- power spectrum
- Poynting–Robertson effect
- PPM Star Catalogue
- p-process
- Praesepe
- preceding
- precession
- precession constant
- precession of the equinoxes
- precursor pulse
- pre-nova
- pressure broadening
- Príbram meteorite
- primary cosmic ray
- primary minimum
- primary mirror
- prime focus
- prime meridian
- prime vertical
- primordial fireball
- primordial galaxy
- Principia
- principle of equivalence -> equivalence principle
- prism
- prismatic astrolabe
- probable error
- Procyon
- prograde motion -> direct motion
- prolate spheroid -> spheroid
- Prometheus (moon)
- prominence
- prominence spectroscope
- promontorium
- proper motion
- proper time
- proplyd
- proportional counter
- Prospero (moon)
- Proteus (moon)
- protogalaxy
- proton
- proton–proton reaction
- protoplanet
- protoplanetary nebula
- 1
- 2
- protostar
- protosun
- Proxima Centauri
- p-spot
- Ptolemaic system
- Ptolemy <-> Claudius Ptolemaeus
- Publications of the Astronomical Society of the Pacific
- Puck (moon)
- Pulcherrima -> Izar
- pulsar
- pulsating variable
- pulsation mode
- pulse broadening
- pulse profile
- pulse width
- Pup (Sirius B)
- pupil
- Puppid–Velid meteors
- Puppis (constellation)
- Purkinje effect
- PV Telescopii star
- Pyxis
- PZT -> photographic zenith tube
Q
[edit]- Q-class asteroid
- Q magnitude
- QSO -> quasi-stellar object
- QSS -> quasi-stellar radio source
- quadrant
- Quadrantid meteors
- quadrature
- quadrupole
- quantum
- quantum cosmology
- quantum efficiency
- quantum gravitation
- quantum theory
- Quaoar
- quark
- quark star
- quasar
- quasi-stellar object
- quasi-stellar radio source
- quiescent prominence
- quiet sun
- quintessence -> dark energy
R
[edit]- RA -> right ascension
- radar astronomy
- radar meteor
- radial pulsation
- radial velocity
- radial-velocity spectrometer
- radian
- radiant
- radiation
- radiation belt
- radiation era
- radiation laws -> Planck's law -> Stefan–Boltzmann law -> Wien's displacement law
- radiation pressure
- radiation temperature
- radiative equilibrium
- radiative recombination -> free–bound transition
- radiative transfer
- radiative zone
- radioactive age dating
- radio astrometry
- RadioAstron
- radio astronomy
- radio galaxy
- radiogenic
- radioheliograph
- radio interferometer
- radio jet -> jet (astronomy)
- radio meteor
- radiometer
- radiometric dating -> radioactive age dating
- radionuclide
- radio source
- radio star
- radio telescope
- radio waves
- radio window
- radius–luminosity relation
- radius of curvature
- radius vector
- Raman effect
- Ramaty High-Energy Solar Spectroscopic Imager
- rampart crater
- Ramsden disk
- Ramsden eyepiece
- Ranger (Moon probes)
- RAS -> Royal Astronomical Society
- Rasalgethi
- Rasalhague
- Ra-Shalom (asteroid)
- R association
- raster
- raster scan
- RAS thread
- RATAN-600
- Rayleigh criterion
- Rayleigh–Jeans formula
- Rayleigh limit -> Rayleigh criterion
- Rayleigh number
- Rayleigh scattering
- crater rays
- R Canis Majoris star
- R-class asteroid
- R Coronae Borealis star
- Grote Reber
- receiver
- 1
- 2
- reciprocity failure
- recombination
- recombination epoch
- recombination line
- rectangular coordinates
- recurrent nova
- recycled pulsar
- reddening
- red dwarf
- red giant
- Red Planet -> Mars (planet)
- redshift
- redshift–distance relation
- redshift–magnitude relation
- Red Spot -> Great Red Spot
- reduced proper motion
- red variable
- reference frame -> frame of reference
- reference star
- reflectance spectrum
- reflecting telescope
- reflection effect
- reflection grating
- reflection nebula
- reflection variable
- reflector -> reflecting telescope
- refracting telescope
- atmospheric refraction
- refractive index
- refractor -> refracting telescope
- refractory
- regio
- Regiomontanus
- regmaglypt
- regolith
- regression of nodes
- Regulus
- relative orbit
- relative sunspot number
- relativistic beaming
- relativistic velocity
- relativity
- relaxation time
- remote sensing
- réseau
- residuals
- resolution -> resolving power
- resolving power
- resonance
- resonance line
- resonant scattering
- rest mass
- restricted three-body problem
- retardation
- retardation plate -> wave plate
- reticle
- Reticulum (constellation)
- reticulum (planets)
- retrograde motion
- reversing layer
- revolution
- RFT -> richest-field telescope
- RGO -> Royal Greenwich Observatory
- RGU photometry
- Rhea (moon)
- RHESSI -> Ramaty High-Energy Solar Spectroscopic Imager
- Rho Cassiopeiae star
- Rho Ophiuchi Nebula
- Richardson–Lucy algorithm
- richest-field telescope
- Rigel
- right ascension
- Rigil Kentaurus -> Alpha Centauri
- rille (Moon)
- rima
- planetary ring
- ring arcs
- ring galaxy
- Ring Nebula
- rise time
- rising
- George Willis Ritchey
- Ritchey–Chrétien telescope
- R magnitude
- Robertson–Walker metric
- Roche limit
- Roche lobe
- ROE -> Royal Observatory, Edinburgh
- Ole Christensen Römer
- Olaus Christensen Römer -> Ole Christensen Römer
- Ronchi test
- Rood–Sastry type
- roof prism
- Roque de los Muchachos Observatory
- Rosalind (moon)
- Rosat
- Rosetta
- Rosette Nebula
- Frank Elmore Ross
- Third Earl of Rosse <-> William Parsons
- Rosseland mean opacity
- Bruno Benedetto Rossi
- Rossiter effect
- Rossi X-ray Timing Explorer
- rotating variable
- rotation
- rotation curve
- rotation effect -> Rossiter effect
- rotation measure
- Royal Astronomical Society
- Royal Greenwich Observatory
- Royal Observatory, Edinburgh
- r-process
- RR Lyrae star
- RRs variable -> Delta Scuti star
- RR Telescopii star
- RS Canum Venaticorum star
- R star -> carbon star
- Rubin–Ford effect
- runaway star
- rupes
- Henry Norris Russell
- Russell–Vogt theorem -> Vogt–Russell theorem
- RV Tauri star
- RW Aurigae star
- RXTE -> Rossi X-ray Timing Explorer
- Martin Ryle
- Ryle Telescope
S
[edit]- SAAO -> South African Astronomical Observatory
- Sabik
- Sachs–Wolfe effect
- Sacramento Peak Observatory
- Carl Edward Sagan
- Sagitta (constellation)
- Sagittarius (constellation)
- Sagittarius A
- Sagittarius Arm
- Sagittarius Dwarf Galaxy
- Saha ionization equation
- Sakigake
- Salpeter function -> initial mass function
- Salpeter process -> triple-alpha process
- SALT -> South African Large Telescope
- SAMPEX -> Solar, Anomalous, and Magnetospheric Particle Explorer
- Allan Rex Sandage
- SAO -> Smithsonian Astrophysical Observatory
- SAO Catalog -> Smithsonian Astrophysical Observatory Star Catalog
- saros
- SAS -> Small Astronomy Satellite
- satellite
- Saturn (planet)
- Saturn Nebula
- scale height
- scattered-disk object
- scatter ellipse
- scattering
- Scheat
- Schechter function
- Schedar -> Shedir
- Christoph Scheiner
- Giovanni Virginio Schiaparelli
- schiefspiegler telescope
- Maarten Schmidt
- Schmidt camera
- Schmidt–Cassegrain telescope
- Schönberg–Chandrasekhar limit -> Chandrasekhar–Schönberg limit
- Schröter effect
- (Samuel) Heinrich Schwabe
- Karl Schwarzschild
- Schwarzschild black hole
- Schwarzschild radius
- Schwarzschild telescope
- Comet 29P/Schwassmann–Wachmann 1
- scintillation
- scintillation counter
- S-class asteroid
- Sco-Cen Association
- scopulus
- Scorpius (constellation)
- Scorpius X-1
- Scotch mount
- SC star -> S star
- SCT -> Schmidt–Cassegrain telescope
- Sculptor (constellation)
- Sculptor group
- Scutum (constellation)
- SDO -> Solar Dynamics Observatory
- S Doradus star
- SDSS photometry
- Search for Extraterrestrial Intelligence
- Seashell Galaxy
- season
- (Pietro) Angelo Secchi
- Secchi classification
- second
- leap second
- secondary cosmic ray
- secondary crater
- secondary minimum
- secondary mirror
- second contact
- second of arc
- secular
- secular acceleration
- secular parallax
- secular perturbation
- secular variable
- seeing
- segmented mirror
- selected areas -> Kapteyn Selected Areas
- selective absorption
- Selene (Moon probe)
- selenology
- self-absorption
- semidetached binary
- semidiameter
- semi-forbidden line -> forbidden line
- semimajor axis
- semiregular variable
- sensitivity
- separation
- Serpens (constellation)
- Serrurier truss
- Setebos
- SETI -> Search for Extraterrestrial Intelligence
- setting
- setting circle
- Seven Sisters -> Pleiades
- Sextans (constellation)
- sextant
- Carl Keenan Seyfert
- Seyfert galaxy
- Seyfert's Sextet
- Shack–Hartmann test -> Hartmann test
- shadow bands
- shadow transit
- Shapiro delay
- Harlow Shapley
- Shapley Concentration -> supercluster
- shatter cone
- Shaula
- Shedir
- shell burning
- shell galaxy
- shell star
- shepherd moon
- shergottite
- shield volcano
- shock metamorphism
- Eugene Merle Shoemaker
- Comet Shoemaker–Levy 9 (D/1993 F2)
- shooting star -> meteor
- short-period comet
- short-period variable
- Sickle (asterism)
- side lobe
- sidereal
- sidereal day
- sidereal month
- sidereal period
- sidereal rate
- sidereal time
- sidereal year
- siderite -> iron meteorite
- siderolite -> stony-iron meteorite
- siderophyre
- siderostat
- Siding Spring Observatory
- Sigma Octantis
- signal-to-noise ratio -> sensitivity
- Sikhote–Alin meteorite
- silicon burning
- silicon star
- silvering
- SIMBAD
- SIM PlanetQuest
- single-lined binary
- singularity
- Sinope (moon)
- sinuous rille
- sinus
- SiO maser
- Sirius
- Sirrah
- Willem de Sitter
- SI units
- six-colour system
- 61 Cygni
- SKA -> Square Kilometre Array
- sky brightness
- Skylab
- Earl Carl Slipher
- Vesto Melvin Slipher
- Sloan Digital Sky Survey
- slow nova
- slow pulsator
- SMA -> Submillimeter Array
- Small Astronomy Satellite
- small circle
- Small Magellanic Cloud
- SMART-1
- SMC -> Small Magellanic Cloud
- Smithsonian Astrophysics Observatory
- Smithsonian Astrophysics Observatory Star Catalog
- SMM -> Solar Maximum Mission
- George Fitzgerald Smoot III
- SNC meteorites
- SNR -> supernova remnant
- SNU -> solar neutrino unit
- SOAR -> Southern Astrophysical Research telescope
- SOFIA -> Stratospheric Observatory for Infrared Astronomy
- soft gamma-ray repeater
- soft X-rays
- SO galaxy -> lenticular galaxy
- SOHO -> Solar and Heliospheric Observatory
- Sojourner
- Solar, Anomalous, and Magnetospheric Particle Explorer
- solar activity
- Solar and Heliospheric Observatory
- solar antapex
- solar apex
- solar atmosphere
- solar constant
- solar cycle -> sunspot cycle
- solar day
- Solar Dynamics Observatory
- solar dynamo
- solar eclipse
- solar flare
- solar interior
- solar irradiance
- solar mass
- solar maximum
- Solar Maximum Mission
- solar minimum
- solar motion
- solar nebula
- solar neutrino unit
- Solar Orbiter
- solar oscillations -> helioseismology
- solar parallax
- Solar System
- solar telescope
- solar–terrestrial relations
- Solar Terrestrial Relations Observatory
- solar time
- solar tower
- solar wind
- solar year
- solid Schmidt telescope
- solstice
- solstitial colure
- Sombrero Galaxy
- Sothic cycle
- source count
- South African Astronomical Observatory
- South Atlantic Anomaly
- Southern African Large Telescope
- Southern Astrophysical Research Telescope
- Southern Cross
- southern lights
- Southern Reference Stars
- Southern Sky Survey
- South Pole Aitken Basin
- curvature of space -> curvature of spacetime
- space motion
- space probe
- space reddening -> interstellar absorption
- Space Telescope Science Institute
- spacetime
- space velocity
- Spacewatch
- space weather
- spallation
- spark chamber
- spec. -> speculum metal
- Special Astrophysical Observatory
- special theory of relativity
- speckle interferometry
- spectral classification
- spectral index
- spectral line
- spectral type
- spectrogram
- spectrograph
- spectroheliogram
- spectroheliograph
- spectrohelioscope
- spectrometer
- spectrophotometer
- spectrophotometry
- spectropolarimetry
- spectroscope
- spectroscopic binary
- spectroscopic parallax
- spectroscopy
- spectrum
- 1
- 2
- spectrum binary
- spectrum variable -> Alpha2 Canum Venaticorum
- speculum metal
- Harold Spencer Jones
- spherical aberration
- spherical albedo -> Bond albedo
- spherical astronomy
- spherical coordinates
- spheroid
- Spica
- spicule
- spider
- spin
- spinar
- spin casting
- Spindle Galaxy
- spin-down
- spin–orbit coupling
- spin temperature
- spiral arm
- spiral galaxy
- Spirit (Mars rover)
- Lyman Spitzer, Jr
- Spitzer Space Telescope
- spokes
- sporadic meteor
- Gustav Friedrich Wilhelm Spörer
- Spörer minimum
- Spörer's law
- spray
- spring equinox -> vernal equinox
- Springfield mounting
- spring tide
- s-process
- sputtering
- Square Kilometre Array
- Square of Pegasus
- SS Cygni
- SS Cygni star
- SS433
- S star
- ST -> standard time
- standard atmosphere
- standard epoch
- standard solar model
- standard star
- standard time
- standstill
- star
- starburst galaxy
- star cluster
- star count
- Stardust
- Stark broadening
- starquake
- starspot
- star streaming
- static limit
- static universe
- stationary point
- 1
- 2
- statistical parallax
- steady-state theory
- Stefan–Boltzmann constant
- Stefan–Boltzmann law
- Stefan's law -> Stefan–Boltzmann law
- stellar association
- stellar atmosphere
- stellar evolution
- stellar interferometer
- stellar population
- stellar structure
- stellar wind
- Stephano (moon)
- Stephan's Quintet
- step method -> Argelander step method -> Pogson step method
- steradian
- STEREO -> Solar Terrestrial Relations Observatory
- stereo comparator
- Steward Observatory
- stishovite
- Stokes parameters
- Stonyhurst heliographic coordinates
- stony-iron meteorite
- stony meteorite
- stratigraphy
- stratopause
- stratosphere
- Stratospheric Observatory for Infrared Astronomy
- streamer
- Strehl ratio
- strewn field
- 1
- 2
- string -> cosmic string
- Bengt Georg Daniel Strömgren
- Strömgren photometry
- Strömgren sphere
- strontium star
- Struve
- Friedrich Georg Wilhelm von Struve
- Otto Struve
- Otto Wilhelm Struve
- STScI -> Space Telescope Science Institute
- style
- Subaru Telescope
- subatomic particle -> elementary particle
- subdwarf
- subgiant
- subluminous star
- sublunar point
- Submillimeter Array
- Submillimeter Wave Astronomy Satellite
- submillimetre astronomy
- sub-pulse
- subsolar point
- substellar object
- substellar point
- substorm
- sudden ionospheric disturbance
- Abd al-Raman al-Sufi
- Suisei
- sulcus
- summer solstice -> solstice
- Summer Time
- Summer Triangle
- Sun
- sundial
- sundog -> parhelion
- Sunflower galaxy
- sungrazer -> Kreutz sungrazer
- sunrise
- sunset
- sunskirter
- sunspot
- sunspot cycle
- Sunyaev–Zel'dovich effect
- supercluster
- supergalactic plane
- supergiant
- supergiant elliptical
- supergranulation
- superheterodyne receiver
- superhump -> SU Ursae Majoris star
- superior conjunction
- superior planet
- superluminal velocity
- supermassive black hole
- supermassive star
- supermaximum -> SU Ursae Majoris star
- supernova
- Supernova 1987A
- supernova remnant
- super-rotation
- super-Schmidt telescope
- superstring theory
- supersynthesis
- surface brightness
- surface gravity
- surface temperature
- surge prominence
- Surveyor (space probes)
- SU Ursae Majoris star
- Suzaku
- S Vulpeculae star
- Swan bands
- Swan Nebula -> Omega Nebula
- SWAS -> Submillimeter Wave Astronomy Satellite
- Swift (satellite)
- Comet 109P/Swift–Tuttle
- Sword Hand of Perseus
- Sword of Orion
- SX Arietis star
- SX Phoenicis star
- Sycorax (moon)
- symbiotic star
- synchronous orbit
- synchronous rotation
- syndyname
- synodic
- synodic month
- synodic period
- Syrtis Major
- Systems I, II, and III
- syzygy
T
[edit]- tachocline
- tachyon
- TAI -> Temps Atomique International -> International Atomic Time
- cometary tail
- tangential velocity
- Tarantula Nebula
- Tarazed
- T association
- Taurid meteors
- Taurus
- Taurus A
- Taurus Molecular Clouds
- Taurus Moving Cluster
- Taurus X-1
- TCB -> Barycentric Coordinate Time
- T-class asteroid
- TDB -> Temps Dynamique Barycentrique -> Barycentric Dynamical Time
- T dwarf
- Teapot (asterism)
- Comet Tebbutt (C/1861 J1)
- technetium star
- tectonics
- Teide Observatory
- tektite
- telecompressor
- tele-extender
- telescope
- telescope drive -> drive
- telescope mounting -> mounting
- Telescopio Nazionale Galileo
- Telescopium (constellation)
- Telesto
- telluric lines
- tellurium
- Comet 55P/Tempel–Tuttle
- temperature
- temperature minimum
- Tenma
- termination shock
- terminator
- terra
- terracing
- terrestrial age
- Terrestrial Dynamical Time -> Terrestrial Time
- terrestrial planet
- Terrestrial Time
- tesla
- tessera
- Tethys (moon)
- Thalassa (moon)
- Thales of Miletus
- Tharsis Montes
- Thebe (moon)
- Themis family
- Themisto (moon)
- theory of everything -> grand unified theory
- thermal bremsstrahlung -> free–free transition
- thermal equilibrium
- 1
- 2
- thermal radiation
- thermocouple
- thermodynamic equilibrium -> thermal equilibrium
- thermodynamic temperature
- thermopile
- thermosphere
- thinned chip
- Third Cambridge Catalogue
- third contact
- third quarter -> last quarter
- 30 Doradus -> Tarantula Nebula
- Thirty Meter Telescope
- tholus
- William Thomson -> Lord Kelvin
- Thomson scattering
- three-body problem
- three-colour photography -> astrophotography
- three-colour photometry -> Johnson photometry
- three-kiloparsec arm
- Thuban
- Thule (asteroid)
- tidal bulge
- tidal evolution
- tidal force
- tidal friction
- tidal heating
- tides
- time
- time dilation
- time of perihelion passage
- time zone
- TiO bands
- tip–tilt mirror
- Tisserand parameter
- Titan (moon)
- Titania (moon)
- Titius–Bode law -> Bode's law
- TLP -> lunar transient phenomenon
- TMT -> Thirty Meter Telescope
- TNG -> Galileo National Telescope
- TNO -> trans-Neptunian object
- Toby Jug Nebula
- Tolman test
- Clyde William Tombaugh
- topocentric
- topocentric coordinates
- Torino scale
- Toro (asteroid)
- torquetum
- torus
- total eclipse
- totality
- total magnitude -> integrated magnitude
- total solar irradiance
- Toutatis (asteroid)
- TRACE -> Transition Region and Coronal Explorer
- train (meteors)
- transfer function
- transfer lens
- transfer orbit
- transient lunar phenomenon -> lunar transient phenomenon
- meridian transit
- planetary transit
- transit circle
- transit instrument
- transition probability
- transition region
- Transition Region and Coronal Explorer
- transmission grating
- trans-Neptunian object
- atmospheric transparency
- transverse velocity -> tangential velocity
- Trapezium (star)
- Triangulum (constellation)
- Triangulum Australe (constellation)
- Triangulum Galaxy
- Trifid Nebula
- trigonometric parallax
- triple-alpha process
- triplet (lens)
- triquetrum
- trischiefspiegler -> schiefspiegler telescope
- Triton (moon)
- Trojan asteroid
- tropic
- tropical month
- tropical period
- tropical year
- Tropic of Cancer
- Tropic of Capricorn
- tropopause
- troposphere
- true anomaly
- true equator
- true equinox
- true pole
- Trumpler classification
- Trumpler star
- TT -> Terrestrial Time
- T Tauri star
- T Tauri wind
- Tucana (constellation)
- Tully–Fischer relation
- Tunguska event
- tuning-fork diagram
- atmospheric turbulence
- turnoff point
- Nasir al-Din al-Tusi
- Comet 41P/Tuttle–Giacobini–Kresák
- 21-centimetre line
- twilight
- twinkling
- two-body problem
- two-colour diagram
- two-colour photometry -> BV photometry
- Two-Micron All-Sky Survey
- two-spectrum binary -> composite-spectrum binary
- Tycho Brahe
- Tycho Catalogue
- Tychonic system
- Tycho's Star
- Type I supernova -> supernova
- Type II supernova -> supernova
U
[edit]- UBV photometry -> Johnson photometry
- UBVRIJKL photometry -> Johnson photometry
- U-class asteroid
- U Geminorum star
- Uhuru
- UKIDSS -> UKIRT Infrared Deep-Sky Survey
- UKIDSS photometry
- UKIRT -> United Kingdom Infrared Telescope
- UKIRT Infrared Deep-Sky Survey
- UKST -> United Kingdom Schmidt Telescope
- ultra-compact dwarf galaxy
- ultra-luminous infrared galaxy
- ultraviolet astronomy
- ultraviolet excess star
- ultraviolet photometry
- ultraviolet radiation
- Ulugh Beg
- Ulysses (spacecraft)
- U magnitude
- umbra
- 1
- 2
- Umbriel (moon)
- undae
- undersampling
- Undina family
- unfilled aperture
- unit distance
- United Kingdom Infrared Telescope
- United Kingdom Schmidt Telescope
- Universal Time
- Universe
- unsharp masking
- upper culmination -> culmination
- Upsilon Sagittarii star
- Uranometria
- Uranus
- Urca process
- ureilite
- Harold Clayton Urey
- Ursa Major
- Ursa Major Moving Cluster
- Ursa Minor
- Ursid meteors
- US Naval Observatory
- USNO CCD Astrograph Catalog
- UT -> Universal Time
- UTC -> Universel Temps Coordonné -> Coordinated Universal Time
- Utopia Planitia
- UU Herculis star
- UV -> ultraviolet
- uvby system -> Strömgren photometry
- UV Ceti star
- UV Persei star
- UXor -> UX Orionis star
- UX Orionis star
- UX Ursae Majoris star
V
[edit]- vacuum energy
- Valhalla (impact basin)
- Valles Marineris
- vallis
- James Alfred Van Allen
- Van Allen Belts
- Van Biesbroeck's Star
- Hendrik van de Hulst
- van Maanen's Star
- variable star
- variation
- 1
- 2
- variation of latitude -> latitude variation
- vastitas
- Vatican Advanced Technology Telescope
- VBLUW photometry -> Walraven photometry
- V-class asteroid
- Vega (star)
- Vega probes
- Veil Nebula
- Vela (constellation)
- Vela pulsar
- Vela Supernova Remnant
- velocity curve
- velocity dispersion
- velocity–distance relation
- Venera
- Venus (planet)
- Venus Express
- VERITAS -> Very Energetic Radiation Imaging Telescope Array System
- vernal equinox
- vertical circle
- Very Energetic Radiation Imaging Telescope Array System
- Very Large Array
- Very Large Telescope
- Very Long Baseline Array
- very long baseline interferometry
- very slow nova -> RR Telescopii star
- Very Small Array
- Vesta (asteroid)
- Viking (space probes)
- VILGEN photometry
- Vilnius photometry
- violent relaxation
- virga
- Virginid meteors
- Virgo (constellation)
- Virgo A
- Virgo Cluster
- Virgo Supercluster -> local supercluster
- virial theorem
- Virtual Observatory
- virtual particle
- Visible and Infrared Survey Telescope for Astronomy
- VISTA -> Visible and Infrared Survey Telescope for Astronomy
- visual binary
- visual magnitude
- VLA -> Very Large Array
- VLBA -> Very Long Baseline Array
- VLBI -> very long baseline interferometry
- VLBI Space Observatory Programme
- VLT -> Very Large Telescope
- V magnitude
- Hermann Carl Vogt
- Vogt–Russell theorem
- void
- Voigt profile
- Volans
- volatile
- von Zeipel theorem
- Voyager (space probes)
- VSOP -> VLBI Space Observatory Programme
- Vulcan (hypothetical planet)
- Vulpecula (constellation)
- VV Cephei star -> Zeta Aurigae star
- VV Sculptoris star
W
[edit]- walled plain
- Walraven photometry
- waning
- Washington Double Star Catalog
- Water Jar
- water maser -> H2O maser
- water of hydration
- wavefront
- waveguide
- wavelength
- wavenumber
- wave plate
- waxing
- WC star -> Wolf–Rayet star
- WDS -> Washington Double Star Catalog
- weber
- weird terrain
- Carl Friedrich von Weizsäcker
- Werner lines
- Comet West (C/1975 V1)
- Westerbork Radio Observatory
- Wezen
- Fred Lawrence Whipple
- Whipple Observatory -> Fred Lawrence Whipple Observatory
- Whirlpool Galaxy
- whistler
- white dwarf
- white hole
- white-light corona
- WHT -> William Herschel Telescope
- Wide Field Infrared Survey Explorer
- Widmanstätten pattern
- Wielen dip
- Wien's displacement law
- Wild Duck Cluster
- Wild's Triplet
- Rupert Wildt
- Wilkinson Microwave Anisotropy Probe
- William Herschel Telescope
- Robert Woodrow Wilson
- Wilson–Bappu effect
- Wilson effect
- Comet 107P/Wilson–Harrington
- WIMP
- Wind (satellite)
- winter solstice -> solstice
- WISE -> Wide Field Infrared Survey Explorer
- WIYN Telescope
- WMAP -> Wilkinson Microwave Anisotropy Probe
- W. M. Keck Observatory
- WN star -> Wolf–Rayet star
- Maximilian ('Max') Franz Joseph Cornelius
- (Johann) Rudolf Wolf
- Wolf diagram
- Wolf–Lundmark–Melotte system
- Wolf–Rayet star
- Wolf sunspot number
- Wolf 359
- Wollaston prism
- Wolter telescope
- Richard van der Riet Woolley
- world line
- wormhole
- Wright telescope
- wrinkle ridge
- WR star -> Wolf–Rayet star
- W Serpentis star -> Algol star
- W Ursae Majoris star
- W Virginis star
- Wyoming Infrared Observatory
- WZ Sagittae star
X
[edit]- XMM-Newton
- X-ray astronomy
- X-ray background
- X-ray binary
- X-ray bright point -> coronal bright point
- X-ray burst
- X-ray calorimeter
- X-ray nova
- X-ray pulsar
- X-rays
- X-ray source
- X-ray telescope
- X-ray Timing Explorer
- X-ray transient
- XTE -> Rossi X-ray Timing Explorer
- XUV -> extreme ultraviolet
Y
[edit]- Yagi antenna
- Yale Bright Star Catalogue -> Bright Star Catalogue
- Yarkovsky effect
- Y dwarf
- year
- Yepun
- Yerkes Observatory
- Yerkes system
- 1
- 2
- Y magnitude
- Yohkoh
- yoke mounting
- YY Orionis star
Z
[edit]- z -> redshift
- ZAMS -> zero-age main sequence
- Z Andromedae star
- Zanstra method
- ZC -> Zodiacal Catalogue
- Z Camelopardalis star
- ZD -> zenith distance
- Zeeman effect
- Zelenchukskaya
- zenith
- zenithal attraction
- zenithal hourly rate
- zenith distance
- zenith telescope
- zero-age horizontal branch
- zero-age main sequence
- Zeta Aurigae star
- ZHR -> zenithal hourly rate
- zirconium star -> S star
- Z magnitude
- zodiac
- Zodiacal Catalogue
- zodiacal dust
- zodiacal light
- Zond
- zone catalogue
- zone of avoidance
- zone time
- Zubenelgenubi
- Zürich relative sunspot number -> relative sunspot number
- Fritz Zwicky
- Zwicky Catalogue
- ZZ Ceti star
Feature entries
[edit]- active galactic nucleus
- Big Bang theory
- black hole
- cosmic microwave background
- cosmology
- extrasolar planet
- galaxy evolution
- gamma-ray burst
- nova
- pulsar
- quasar
- redshift survey
- Search for Extraterrestrial Intelligence
- stellar evolution
- supernova
- time
Notes
[edit]- The list might contain errors
- When you click a red link, please check the spelling of the title before you create the article
- 1, 2 and 3 means that there exist more than one meaning of the term on the previous line
Sources
[edit]- Ridpath, Ian (2007). Oxford Dictionary of Astronomy. Oxford University Press.