January 25, 2010
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.
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
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