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JWST Finds Night-Side Clouds, Hot Evening Winds on Exoplanets

6/17/2026

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Summary

Story summary

Sagnick Mukherjee (Johns Hopkins) used JWST to detect a cloud cycle on WASP-94A b, clouds forming on the nightside, drifting to the limb and evaporating on the dayside.
JWST spectra show planet has five times solar oxygen and carbon, lower than Hubble estimates.
Cyril Gapp (Max Planck Institute) used JWST to compare dawn and dusk on WASP-121 b, finding a hotter evening side with winds and water-vapor breakup.

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Story summary

Sagnick Mukherjee (Johns Hopkins) used JWST to detect a cloud cycle on WASP-94A b, clouds forming on the nightside, drifting to the limb and evaporating on the dayside.
JWST spectra show planet has five times solar oxygen and carbon, lower than Hubble estimates.
Cyril Gapp (Max Planck Institute) used JWST to compare dawn and dusk on WASP-121 b, finding a hotter evening side with winds and water-vapor breakup.