Scientists are debating whether data from the James Webb Space Telescope is really pointing to biosignature gases in the atmosphere of planet K2-18b. Adriana M. Gutierrez (CI Lab)/NASA-GSFC hide caption toggle caption Adriana M. Gutierrez (CI Lab)/NASA-GSFC Astronomers have been poring over last week's claim of the detection of life-associated gases in the atmosphere of a distant planet named K2-18b — "the strongest evidence yet that life may exist on a planet outside our solar system," as a Uni...