Astronomers using the NASA/ESA/CSA James Webb Space Telescope have obtained and analyzed morning and evening transmission spectra of WASP-39b, a hot-Saturn exoplanet orbiting a star some 700 light-years away in the constellation of Virgo. The spectra are best explained by models in which the evening terminator is hotter than the morning terminator by 177 K. This illustration shows what WASP-39b could look like, based on the current understanding of...
