JWST Captures First Daily Cloud Cycle on Hot Jupiter WASP-94A b | Sand Clouds Form at Dawn, Vanish by Dusk

Webb's NIRSpec separated morning and evening atmospheric limbs on WASP-94A b 700 light-years away. Silicate sand clouds build overnight and fully vaporize above 1,000 degrees Celsius each day, per Science journal May 21, 2026.