Cosmos Nearby Exoplanet Smells Like Rotten Eggs Astronomers detect hydrogen sulphide on an extrasolar planet for the first time. By Bertie Atkinson Published: July 10, 2024 This nearby exoplanet could stink of rotten eggs, because the hot gas envelope of HD 189733b contains hydrogen sulfide. Roberto Molar Candanosa/ Johns Hopkins University SOURCES:Nature