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Half of Milky Way's Matter Comes from Distant Galaxies

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Laser beam pointed at Milky Way

A laser beam from the ESOs Paranal Observatory pointed at the center of the Milky Way.

Credit: ESO/Y. Beletsky

Up to half of the Milky Way is made up of matter that came from distant galaxies, having been ejected from its home during supernova explosions.

From Newsweek
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