WASP-121 b is split between extremes. One side faces its star nonstop and burns at about 2,770 Kelvin. The other stays in darkness and cools to roughly 1,000 Kelvin. Now astronomers have found that even the narrow boundary zones between those halves are not alike. Using the James Webb Space Telescope, a team led by Cyril Gapp of the Max Planck Institute for Astronomy detected clear differences between the planet’s morning and evening terminators…
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