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Astonishing Facts About the Observable Universe

The Milky Way is on a collision course with the nearby Andromeda Galaxy, and both will merge in about 4 billion years.

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Astonishing Facts About the Observable Universe
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    How Many Galaxies Are There?

    How Many Galaxies Are There?

    How have astronomers estimated the number of galaxies in the universe? Galaxies are vast collections of stars that populate our universe. But how many …

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