Scientists scouring space for alien life find a hint on one of our galactic neighbors

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Scientists scouring space for alien life find a hint on one of our galactic neighbors
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Possible sign of life found in the clouds of Venus, scientists say.

That makes phosphine potentially what scientists call a biosignature — a chemical signal that can be detected by spectroscopic telescopes that could indicate a planet harbors at least simple forms of life.

What they have found, however, is that the gas must be continuously produced to make up for its rapid breakdown in the Venusian atmosphere, and that it’s only found in clouds near the equator, which might be expected if it has a biological cause. And that’s exactly where traces of phosphine have now been detected, and at relatively high concentrations of about 20 parts per billion – too high to be explained in any other way.

Greaves explained she was looking for phosphine on Venus mainly as a theoretical test, and the discovery was a “huge surprise.” “Chemical biosignatures are one of the primary tools we have for looking for life in the universe,” said Caleb Scharf, director of astrobiology at Columbia University in New York, who was not involved in the study. “We might not spot aliens directly, but we might be able to ‘smell’ them.”

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