SciTechDaily
By Max Planck Institute for AstronomyJune 16, 2026
James Webb has revealed that the sunrise and sunset sides of WASP-121 b have surprisingly different atmospheres.
Astronomers using the James Webb Space Telescope (JWST) have discovered striking differences between the morning and evening sides of the atmosphere of WASP-121 b, an ultra-hot gas giant located far beyond our solar system. The findings provide the clearest evidence yet that conditions along the planet’s day-night boundary, known as the terminator region, vary dramatically from one side to the other.
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