what are the major diffrences between a galaxy?
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The term "universe" refers to everything that exists, including galaxies and the space between them. A galaxy is a massive cluster of stars (millions or billions) held together by gravity.
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Galaxies are classified by their shape. Each type has different characteristics and a different history of evolution. Some, like the Milky Way, have arms spiraling outward around their center. Elliptical galaxies have less dust than their spiral counterparts, and so the star-making process has all but ended.
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