Hubble Watches an Exoplanet Atmosphere Change Over Three Years

If you want to know more about an exoplanet atmosphere, watch how it changes over time. That’s the mantra of a group of astronomers who just reported on conditions at Tylos, otherwise known as WASP-121 b. Tylos is a hot Jupiter world. It lies in a tidally locked 30-hour orbit around WASP-121. That means the …