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Apr 30, 2015 at 6:47 answer added ProfRob timeline score: 4
Apr 30, 2015 at 6:11 comment added userLTK Here's a scientific American article (1998), that suggests the earth has plutonium created in a supernova. scientificamerican.com/article/do-transuranic-elements-s There's no logical reason I can think of, why a super-nova wouldn't create, at least in trace amounts, most of what we can create in a lab.
Apr 30, 2015 at 5:34 history asked Curious Layman CC BY-SA 3.0