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Transcript of Galaxies
Small galaxies have about 10 million stars.
Large galaxies have about 1 trillion stars. Stars are held within a galaxy by gravity.
In most galaxies stars orbit around the center of galaxies.
Many astronomers theorize there may be black holes in the middle of galaxies.
There are large clumps of galaxies.
This happens because the gravity of the galaxies pull together. How Big Are Galaxies? How Do Galaxies Move? How did Galaxies Form? Most mainstream scientist believe after the big bang particles slowly teamed up together forming stars, star clusters, and eventually galaxies were formed.
Others believe that the universe was first organized into clumps of matter that later divided into galaxies. There are 3 major different types of galaxies. Spiral Galaxies Spiral galaxies have a flat disc, a bulging center, and spiral arms.
At the center of these galaxies a large amount of energy and vivid flares are generated.
The disc contains stars, planets, dust, and gas.
The disc is surrounded by a halo.
Many scientist believe the disc is filled with dark matter.
All parts rotate around the galaxy's center in a regular motion.
The amount of dust and gas allows many new stars form in these in these galaxies.
Older stars are located near the center of these galaxies.
The Milky Way, along with over 2/3 of galaxies have this shape. These galaxies are shaped like ovals.
Elliptical Galaxies contain many old stars.
Elliptical galaxies lack large amounts of gas and dust resulting in few young stars.
These galaxies are some of the largest galaxies in the universe.
These galaxies can, however be small.
Stars in an elliptical galaxy move in random directions. Elliptical Galaxies Galactic Mergers Galaxies often merge together.
This is why galaxies are often in clusters.
When galaxies merge it causes gases to flow to the galactic center. This often triggers rapid star formation.
Our galaxy, the Milky Way is expected to eventually merge with the Andromeda galaxy. Irregular Galaxies These are galaxies without a defined shape.
These galaxies have very young stars.
They also contain a large amount of dust and gas.
Galaxies - NASA Science. (n.d.). NASA Science. Retrieved January 27, 2013, from http://science.nasa.gov/astrophysics/focus-areas/what-are-galaxies/
Galaxies - Space Science for Kids!. (n.d.). Kidipede - Science for Kids - Homework Help for Middle School. Retrieved January 27, 2013, from http://www.scienceforkids.kidipede.com/physics/space/galaxy.htm
Galaxies, Galaxy Information, Galaxy Facts, News, Photos -- National Geographic. (n.d.). Science and Space Facts, Science and Space, Human Body, Health, Earth, Human Disease -National Geographic. Retrieved January 27, 2013, from http://science.nationalgeographic.com/science/space/universe/galaxies-article/
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