Exoplanet WASP-107 b, with 80% the volume of Jupiter but less than 10% of its mass, is 'puffy' due to its low mass, hot atmosphere with little methane, and a core heavier than previously estimated.
Astronomers used spectroscopy with JWST and Hubble to analyze exoplanet light emissions, revealing its hot atmosphere with little methane. The exoplanet's core being more massive than thought provides insights into its formation.
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