Pluto discovery: no craters => active => heat. But sun too distant & tides too weak => still large radioactivity.pic.twitter.com/V7gQn7nkvB
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@NickSzabo4 Didn't expect it to be geologically active. Are radioactive elements the only explanation for heat?
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@NickSzabo4 Interesting. Thanks!Thanks. Twitter will use this to make your timeline better. UndoUndo
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