Published:
January 25, 2010
 The Milky Way and Andromeda galaxies will one day collide despite the fact that space-time itself is expanding. That's because local gravity overpowers the expansion and pull these galaxies toward one another.
Photo by Astronomy: Roen Kelly Whether or not galaxies merge depends on how strong the gravitational attraction is between the galaxies and whether the universe's expansion is more powerful than gravity. |
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