- Plutonium-244 doesn't naturally occur on Earth not because it's too unstable, but because the supernova(s) that seeded our solar system was only powerful enough to produce Uranium-238. There are probably other worlds that do have plutonium, and others where the heaviest element is lead. http://scienceblogs.com/startswithabang/2009/04/03/is-uranium-the-heaviest-natura/ 18 comments space
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