The James Webb Space Telescope has uncovered a striking asymmetry in the atmosphere of a distant exoplanet called WASP-121 b. While the planet's dayside bakes in permanent sunlight, researchers expected its twilight regions to show a gradual transition. Instead, they found something far more dramatic. Powerful winds are sweeping heat from the planet's sun-facing hemisphere toward its evening terminator, making the dusk side hotter and more puffed-up than the dawn side. Scientists also detected evidence that the extreme temperatures are tearing water molecules apart into hydrogen and oxygen. Adding another layer of complexity, mineral clouds appear to be floating through the cooler regions, potentially sculpting the atmosphere's behavior in unexpected ways. According to ScienceDaily, WASP-121 b orbits a star closer than Mercury orbits our Sun, making it one of the most extreme exoplanets known. This discovery reveals how dynamic alien atmospheres can be, even in environments we might assume would be uniform across their surfaces.

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