Sep 25, 2020 09:37 UTC

On September 17 a group of scientists using Earth-based telescopes announced that they had detected phosphine in the atmosphere of Venus. On Earth, phosphine is almost always produced by microbial activity. While geological processes are known that can, in principle, produce phosphine, the concentrations of the gas found on Venus, while small, were nevertheless much too high to be attributable to such sources. So how could the phosphine have gotten there? The simplest explanation is life.