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Scientists Fine-tune Formula for Finding Signs of Life in Alien Air | GeekWire
If we detect oxygen in the atmosphere of an alien world, does that mean life is present? Not necessarily: Scientists say the chemical signature of biological activity is likely to be more subtle, involving a mix of gases that might seem out of whack. Joshua Krissansen-Totton, a UW doctoral student in Earth and space sciences, and David Catling, a professor of Earth and space sciences at the UW, are quoted.
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