There are three main types of galaxies: irregular galaxies with no defined shape, elliptical galaxies that are flattened balls containing only old stars, and spiral galaxies with a central bulge and rotating disk containing gas, dust, and younger stars. Stars form within giant clouds of gas and dust called nebulae, and their lifetime depends on their mass - smaller stars live much longer than larger ones. The universe contains these galaxies, nebulae, and stars, all bound together by gravity.
The document provides an overview of the size and contents of the universe. It begins by explaining that the universe includes all physical matter and energy, from atoms to galaxies. It then notes that the tour will focus on the part of the universe outside Earth. The document goes on to summarize how human understanding of the universe's size has expanded over time, from only a few thousand light years across to immensely larger. It lists some of the key components that make up the universe, such as matter, energy, planets, stars, and more.
The moon revolves around Earth once every 27 days, keeping the same side facing Earth. It reflects sunlight and its illuminated half changes shape in a cycle from new moon to first quarter to full moon to third quarter over 291⁄2 days. The moon is the closest celestial object to Earth at 384,000 km away. It has many impact craters and temperature extremes ranging from 127°C during the day to -173°C at night. Telescopes allow observation of details on the moon's surface.
The document defines and describes various celestial objects in our solar system including: - Rotation is spinning on an axis, while revolution is the path planets make around the sun. - The inner planets are Mercury, Venus, Earth and Mars which are rocky and smaller. The outer planets are the large gaseous planets of Jupiter, Saturn, Uranus and Neptune past the asteroid belt. - Other objects include asteroids in the asteroid belt between Mars and Jupiter, comets that travel in elliptical paths around the sun, and meteors that appear as shooting stars as they burn up in Earth's atmosphere.
The Sun ¡is a star because it is made up of light and heat. is the only star in the solar system. As a star, it is a source of light and heat.
This document provides a summary of stellar evolution from the birth of stars to their death. It discusses how stars are formed inside nebulae from collapsing gas clouds. As stars age, they progress through different stages such as protostars, T-Tauri stars, and red giants. More massive stars may die in supernova explosions, leaving behind neutron stars or black holes. Lower mass stars end as white dwarfs. The document also describes different types of nebulae and compact objects like neutron stars and black holes.
It is a slide showing the general information as well as some interesting information about stars that a student needs for his school.
Stars are giant balls of gas that produce light and heat through nuclear fusion at their cores. They vary greatly in size, from dwarf stars like our Sun to massive supergiant stars over 200 times the Sun's diameter. Stars end their lives in different ways depending on their mass - smaller stars become white dwarfs, while larger stars explode as supernovae or collapse into neutron stars and other compact objects.
Information for Primary School students on stars and constellations. This PowerPoint uses some slides from http://www.slideshare.net/winga1sm/star-powerpoint-3308182 and the rest has been created by me.
The document discusses key facts about our planet Earth. It begins by providing context about our solar system and universe. It then explains that Earth is the third planet from the sun and the only planet that supports life. The document goes on to describe how Earth formed from a hot cloud of gases and cooled over millions of years, developing a crust, mantle and core similar to an egg. Volcanoes are mentioned as openings where molten material from the core is forced out of the crust.
The Moon is Earth's only natural satellite. It has no atmosphere and its surface is marked by craters and dust. The same side always faces Earth. The Moon's diameter is about one quarter that of Earth and it has lower gravity and density than Earth. Temperatures vary greatly from 130°C during the day to -110°C at night. Large flat plains called maria cover parts of the near side, formed by ancient lava flows. Craters and long valleys called rilles are also features of its surface. The Moon orbits Earth about every 27 days in a cycle linked to eclipses.
This powerpoint slidesare from form 3 sallabus and it is about stars and galaxies. Students are allowed to view and upload their ideas of stars and galaxies.
Galaxies come in different sizes and types. They range from dwarfs with a few billion stars to giants with over 100 trillion stars. Galaxies are classified into three main types - ellipticals, spirals, and irregulars. The Hubble sequence further categorizes galaxies based on their visual structure into ellipticals, spirals, barred spirals, and lenticular galaxies. Spiral galaxies have a central bulge and spiral arms, while ellipticals are spherical or ellipsoidal. Interacting galaxies can trigger new star formation when their gas and dust interact during collisions.