Are humans from outer space? It doesn't have the ring of a good question, but bear with us. Of course, Homo sapiens didn't arrive on Earth in spaceships. We evolved here, from Homo erectus, about 200,000 years ago. Homo erectus, in turn, originated roughly a million years ago, solidly on Earth. So we have a long history on this planet. The thing is, we can't trace it all the way back to the beginning. The origins of life on Earth are shrouded in confusion, so much so that some scientists wonder — to other scientists' chagrin — if it started here at all.
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Written by Mae Rice July 6, 2018
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