A ‘hot Jupiter’ exoplanet called HD 189733 b, known for its scorching temperatures and molten glass rain, has been found to contain hydrogen sulfide, giving it a distinctive rotten egg smell. This discovery, made using the James Webb Space Telescope (JWST), sheds light on the composition of exoplanets and provides a stepping stone for understanding planetary formation. While HD 189733 b is unlikely to support life due to its extreme conditions, the presence of hydrogen sulfide suggests that similar molecules could be found on other exoplanets, potentially harboring life.