A giant exoplanet that shouldn’t exist, and it’s colder than anyone expected

HATS-6 b, a Jupiter-sized giant circling a small red dwarf 500 light-years away, shouldn't exist by our best theories of planet formation. Now the James Webb Space Telescope has found rare ammonia in its atmosphere and measured it running hundreds of degrees colder than predicted, likely from mirror-bright clouds, offering fresh clues to how giant planets form around the galaxy's smallest stars.