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Milky way galaxy

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GaneshanS4

The Milky Way Galaxy is a spiral galaxy that contains our solar system. It has a disk shape with a bulge at the center, made up of stars, gas, and dust. There are three major types of galaxies - spiral galaxies which have a disk and bulge, elliptical galaxies which are round without a disk, and irregular galaxies with an irregular shape. The Milky Way Galaxy is a spiral galaxy that rotates and is held together by gravity.

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Milky Way Galaxy S.Ganeshan Dept. of Physics Vivekananda College Tiruvedakam West Madurai
Galaxy •A large assembly of stars and nebulae
Group of Galaxies
The Milky Way •Our galaxy •Flat disk with spiral arms
More about galaxies • There are 3 major types of galaxies • Spiral • Elliptical • Irregular
Spiral galaxies. • Disk shaped with a central bulge. • The center is black Hole
Elliptical galaxies • Elliptical or round shape • No disk • Stars but no gas
Irregular galaxies • Irregular shape, and does not swirl.
Inside the Galaxies • Nebulas (space gas clouds found in spiral galaxies) • Globular Clusters (groups of older stars at the edge of galaxies) • Open Clusters (smaller groups of clusters younger stars)
Milky Way • Spiral • Contains single stars, double stars, star systems, dust and gases • Shaped like a disk with a bulge in the center – The bulge is very dense
The Milky Way Galaxy contains dust and gas. Our Solar System is located in Orion’s Arm of the Milky Way Galaxy.
Milky way galaxy
More Facts about the Milky Way… • Held together by gravity • Can be seen on a very clear night • Got its name from the hazy/milky appearance
Supernova • A _____________ is basically the death of a large star by explosion.
An exploding star is known as a supernova.
Black Holes • A _______ is a giant star or group of stars that has/have collapsed because of their enormous gravity.
Milky way galaxy
Where did its name come from? •It is called a black hole because not even light can escape!
• Almost everything we see in the night sky belongs to the Milky Way • From the outside, our Milky Way might look very much like our cosmic neighbor, the Andromeda galaxy
Milky way galaxy
Milky way galaxy
Milky way galaxy
• It has four major spiral arms and several short arm elements • Each star in the galaxy move in precessing ellipse. • Pin wheel shape of our galaxy suggests that it rotates. • Galaxy does not rotate like a rigid body.
• The orbital speed of the stars and gas about the galactic centre is fairly constant throughout the disk. • Outer stars have taken longer time to travel in their orbit around the galactic centre than the inner stars. • The outer stars lag behind the stars in the inner reaches of the galaxy. • Differential rotation.
• Earth goes round the sun once each years, it takes sun 200 million years to go once round the galaxy. • Huge period of time is called galactic year.
Galactic clusters
• Galaxies are not uniformly distributed throughout the universe. • Some galaxies seemed to be grouped together in clusters.
• A cluster is said to be either poor or rich, depending upon how many galaxies it contains. • Poor clusters , which far out number rich ones, are called groups.
Poor galaxy • Milky Way Galaxy • Andromeda galaxy • Large and small Magellanic clouds • These are called local groups.
• The local Group contains 30 galaxies
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Milky way galaxy

  • 1. Milky Way Galaxy S.Ganeshan Dept. of Physics Vivekananda College Tiruvedakam West Madurai
  • 2. Galaxy •A large assembly of stars and nebulae
  • 4. The Milky Way •Our galaxy •Flat disk with spiral arms
  • 5. More about galaxies • There are 3 major types of galaxies • Spiral • Elliptical • Irregular
  • 6. Spiral galaxies. • Disk shaped with a central bulge. • The center is black Hole
  • 7. Elliptical galaxies • Elliptical or round shape • No disk • Stars but no gas
  • 8. Irregular galaxies • Irregular shape, and does not swirl.
  • 9. Inside the Galaxies • Nebulas (space gas clouds found in spiral galaxies) • Globular Clusters (groups of older stars at the edge of galaxies) • Open Clusters (smaller groups of clusters younger stars)
  • 10. Milky Way • Spiral • Contains single stars, double stars, star systems, dust and gases • Shaped like a disk with a bulge in the center – The bulge is very dense
  • 11. The Milky Way Galaxy contains dust and gas. Our Solar System is located in Orion’s Arm of the Milky Way Galaxy.
  • 13. More Facts about the Milky Way… • Held together by gravity • Can be seen on a very clear night • Got its name from the hazy/milky appearance
  • 14. Supernova • A _____________ is basically the death of a large star by explosion.
  • 15. An exploding star is known as a supernova.
  • 16. Black Holes • A _______ is a giant star or group of stars that has/have collapsed because of their enormous gravity.
  • 18. Where did its name come from? •It is called a black hole because not even light can escape!
  • 19. • Almost everything we see in the night sky belongs to the Milky Way • From the outside, our Milky Way might look very much like our cosmic neighbor, the Andromeda galaxy
  • 23. • It has four major spiral arms and several short arm elements • Each star in the galaxy move in precessing ellipse. • Pin wheel shape of our galaxy suggests that it rotates. • Galaxy does not rotate like a rigid body.
  • 24. • The orbital speed of the stars and gas about the galactic centre is fairly constant throughout the disk. • Outer stars have taken longer time to travel in their orbit around the galactic centre than the inner stars. • The outer stars lag behind the stars in the inner reaches of the galaxy. • Differential rotation.
  • 25. • Earth goes round the sun once each years, it takes sun 200 million years to go once round the galaxy. • Huge period of time is called galactic year.
  • 27. • Galaxies are not uniformly distributed throughout the universe. • Some galaxies seemed to be grouped together in clusters.
  • 28. • A cluster is said to be either poor or rich, depending upon how many galaxies it contains. • Poor clusters , which far out number rich ones, are called groups.
  • 29. Poor galaxy • Milky Way Galaxy • Andromeda galaxy • Large and small Magellanic clouds • These are called local groups.
  • 30. • The local Group contains 30 galaxies