For nearly a century, astronomers have known that the universe is expanding. Most galaxies are carried outward with the flow of space itself. Yet one stubborn exception has lingered in our cosmic ...

The Milky Way’s matter has been imported from other systems, its last major merger happened far more recently than expected, its future with Andromeda is no longer guaranteed, and its structure and ...

Four billion years from now, the Milky Way galaxy as we know it will cease to exist. Our Milky Way is bound for a head-on collision with the similar-sized Andromeda galaxy, researchers announced today ...

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