About this episode
A deep dive into WASP-121b, the ultra-hot Jupiter where the dayside vaporizes metals and liquid ruby rain falls on the night side. Using JWST transit spectroscopy, we read a chemical barcode in starlight to map atmospheric temperature and composition, revealing winds up to 11,000 mph driven by dramatic day–night heating. We explore how the morning and evening terminators are defined by transit geometry on a tidally locked world, why silicate clouds form near the night side, and what these observations tell us about exoplanetary weather and the future of atmospheric mapping beyond our solar system.
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