Inside Deep Undersea Rocks, Life Thrives Without the Sun | Quanta Magazine

… it’s possible that life might have gotten its start on the surface of the Earth, where it found creative ways to survive and spread, including to deeper environments. But it’s also possible that life began underground, at some fortuitous juncture between rock and water — eventually also making its way to the surface and figuring out how to harness the sun’s energy. (On that note, photosynthesis-dependent surface life and radiolysis-dependent subsurface life have so far been found to have an ancient, shared ancestry — but some researchers are intrigued by the possibility that life could have evolved more than once on Earth, in a “second genesis.”)
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