An Arizona cosmologist urged scientists to search for a "shadow biosphere" that may exist, undetected, alongside our own. Shadow life, it has been suggested, would be descended of a "second genesis" and would prove that life on Earth evolved twice over. | Harper's Magazine

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An Arizona cosmologist urged scientists to search for a “shadow biosphere” that may exist, undetected, alongside our own. Shadow life, it has been suggested, would be descended of a “second genesis” and would prove that life on Earth evolved twice over.

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An Arizona cosmologist urged scientists to search for a “shadow biosphere” that may exist, undetected, alongside our own. Shadow life, it has been suggested, would be descended of a “second genesis” and would prove that life on Earth evolved twice over.

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