New From JWST: An Exoplanet Atmosphere as Never Seen Before

The JWST just scored another first: a detailed molecular and chemical portrait of a distant world’s skies. The telescope’s array of highly sensitive instruments was trained on the atmosphere of a “hot Saturn”—a planet about as massive as Saturn orbiting a star some 700 light-years away—known as WASP-39 b. While JWST and other space telescopes, including Hubble and Spitzer, previously have revealed isolated ingredients of this broiling planet’s atmosphere, the new readings provide a full menu of atoms, molecules and even signs of active chemistry and clouds.

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