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NASA Goddard Space Flight Center

NASA Goddard Space Flight Center

Federal Research Facility

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The K2-18b biosignature hunt

New Capabilities

Center for skeptical reanalysis of biosignature claims

Cambridge astronomers announced they'd found dimethyl sulfide and dimethyl disulfide in the atmosphere of K2-18bโ€”molecules that, on Earth, only life produces. The detection using JWST's mid-infrared instrument hit 3-sigma confidence, meaning a 0.3% chance it's statistical noise. If real, it's the strongest evidence yet of biology beyond our solar system.

Updated Jan 7