The James Webb Space Telescope (JWST) has made a weather forecast for the exoplanet WASP-94Ab, a world with clouds of sand in the morning that gradually give way to a clear sky at sunset.
It is the first time that the daily cycle of weather has been observed on a hot Jupiter exoplanet. Furthermore, the clear evening sky has provided astronomers with an unobscured view of WASP-94Ab's atmospheric composition, finding it to be closer to that of our own Jupiter than previous inaccurate measurements had suggested.
