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Bookmark or Share- Galaxies: Collisions, Types and How They're Made | SpaceGalaxies are composed of stars, dust and dark matter, all held together by gravity. Astronomers aren't certain exactly how galaxies formed. After the Big Bang, space was made up almost entirely...
- How galaxies form: Theories, variants and growth | SpaceHow galaxies form: Theories, variants and growth. Our best current theory about how galaxies form involves gravity, dark matter and mergers. This Hubble image shows two galaxies, NGC4038 and...
- What is a galaxy? | Live ScienceGalaxies are groups of stars and other space objects held together by gravity. There are more than 100 billion galaxies in the universe, each presenting beautiful structures that can be seen in...
- Galaxies—facts and information - National GeographicGalaxies are sprawling systems of dust, gas, dark matter, and anywhere from a million to a trillion stars that are held together by gravity. Nearly all large galaxies are thought to also...
- What Is a Galaxy? | NASA Space Place – NASA Science for KidsA galaxy is a huge collection of gas, dust, and billions of stars and their solar systems. A galaxy is held together by gravity. Our galaxy, the Milky Way, also has a supermassive black hole in the middle. When you look up at stars in the night sky, you’re seeing other stars in the Milky Way.
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