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A 35-light-year-away exoplanet with a molten surface and sulfur-rich atmosphere may represent a new planetary class.
A newly discovered exoplanet, L 98-59 d, located 35 light-years away, may belong to a previously unknown class of planets characterized by a deep, long-lived magma ocean and a thick, sulfur-rich atmosphere.
About 1.6 times Earth’s size, it has an unusually low density and contains hydrogen sulfide and other volatile gases, sustained by a molten silicate interior that traps sulfur over billions of years.
Observations from the James Webb Space Telescope and ground-based instruments, combined with computer models, suggest the planet’s extreme heat—driven by stellar radiation, tidal forces, and a strong greenhouse effect—keeps its surface molten.
This challenges traditional planetary classifications and indicates such molten worlds may be more common than thought, offering new insights into planetary formation and evolution.
Un exoplaneta de 35 años luz de distancia con una superficie fundida y una atmósfera rica en azufre puede representar una nueva clase planetaria.