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Collision course

Four billion years from now, the Andromeda galaxy will have a close encounter with the Milky Way. The two galaxies will commence a dance of disruption that will, over the course of another two billion years, lead to their complete union.

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Figure 1: A cosmic encounter.



  1. *This News & Views article was published online on 22 August 2012.


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Correspondence to R. Brent Tully.

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Tully, R. Collision course. Nature 488, 600–601 (2012).

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