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4:47 PM | February 17, 2013
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The flyby of asteroid 2012 DA14 and especially the past and present Russian meteors are impressive reminders that the terrestrial biosphere can be affected also by extraterrestrial forces. However contrary to headlines by the general media the connection between mass extinctions and large meteor impacts is still poorly understand. The Scaglia Variegata and Scaglia Cinerea [...]

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