Astrophysics Supplement
Thursday, September 20, 2012
2.5 Myr Eltanin impact
2.5 Myr Eltanin impact
http://www.universetoday.com/97455/did-a-killer-asteroid-drive-the-planet-into-an-ice-age/#.UFrSlddHhFA.google_plusone_share
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