The morning sky of WASP-94A b is thick with cloud. By the time the same air drifts around to the planet’s evening side, the cloud is gone. And the cloud is not water or ice. It is rock — magnesium and silicon, vaporized by heat and condensed into a mineral haze that forms at dawn and burns off by dusk. That split is the discovery. Astronomers using the James Webb Space Telescope have, for the first time, read the weather on the two opposite face…
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