Using the James Webb Space Telescope, astronomers discovered that the exoplanet WASP-107 b has an asymmetric atmosphere, with significant differences between its sides. WASP-107 b, orbiting an orange star 210 light-years away, is 94% the size of Jupiter but only 10% of its mass, making it extremely “puffy.” This asymmetry, the first observed from space, was detected by studying light from its host star during transits. The planet is tidally locked, with one side always facing the star, completing an orbit in about five Earth days.