M31 Galaxy Collision Briefing (201205310002HQ)

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    John Grunsfeld, Associate Administrator for the Science Mission Directorate at NASA Headquarters, speaks during a media briefing, Thursday, May 31, 2012, at NASA Headquarters in Washington. NASA Astronomers announced Thursday they can now predict with certainty the next major cosmic event to affect our galaxy, sun and solar system: the titanic collision of our Milky Way galaxy with the neighboring Andromeda galaxy. Photo Credit: (NASA/Paul E. Alers)

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