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knb comments on How inevitable was modern human civilization - data - Less Wrong
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Really? Thanks. I thought it mostly was derived from gravitational energy as the earth formed and only a bit of extra nuclear heating. Though I guess it might not make sense that it would still be hot then...
Well, generally, elements heavier than iron only show up when a star goes kablewey, right? so it's "solar", but it's not OUR solar, which was kinda the point, I guess.
Oh, good point about supernovae. I didn't know that.