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How Galaxies Work | HowStuffWorks

Galaxies are large systems of stars, gas, dust and dark matter that orbits a center and is bound by gravity. Learn about the characteristics of galaxies. ....

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Just How Many Galaxies Are in the Universe?

So much about galaxies remains a mystery. We know what they're made of and that we live in one (the Milky Way), but how many galaxies are in the universe? ....

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