New Hubble observations indicate that our galaxy, the Milky Way, will physically collide and merge with the Andromeda galaxy... in about 4 billion years. This simulation shows how we think this event will unfold, taking about 2 billion years for the two to merge.Moreinfo: http://blogs.discovermagazine.com/badastronomy/2012/05/31/hold-on-tight-in-4-billion-years-were-due-for-a-galactic-collision/Credit: NASA, ESA, T. Hallas, and A. Mellinger
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