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WASP-39b's atmospheric composition This illustration shows the transmission spectrum of a hot Jupiter known as WASP-39b, captured by JWST's Near-Infrared Spectrograph (NIRSpec) in July 2022. JWST detected carbon dioxide in WASP-39b's atmosphere, marking the first time CO2 has been detected in an exoplanet's atmosphere. NASA, ESA, CSA, and L. Hustak (STScI); Science: The JWST Transiting Exoplanet Community Early Release Science Team