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Phosveen, a Biosignature Gas in the Atmosphere
Dr. Phosveen is a fascinating molecule, shaped like a pyramid with a phosphorus up top and then three hydrogens. People haven't heard of phosphine because it's not really popular on Earth. We shouldn't find it anywhere and yet we do. This is kind of weird molecule that seems to be made by life and we don't even know why. Life clearly finds a use for it. It's not the only molecule the life is willing to sacrifice energy to make but we don't know how or why life is even making it.