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Key discovery for understanding the Big Bang Theory

byMelissa Hekkers
|
16 Jun 2025 10h15
a large cluster of stars in the sky
© Unsplash

The James Webb Space Telescope has once again enabled scientists to take a step forward in understanding distant worlds.

By studying the atmosphere of a burning hot exoplanet located nearly 900 light-years away, researchers have uncovered its tumultuous past and extreme environment. This gas giant, named WASP-121b, is intriguing due to its shape, composition, and history, all of which have been illuminated in a new light by recent observations.

Contrary to previous assumptions, according to the researchers, WASP-121b did not form close to its current star. Instead, it is believed to have originated in a colder and more distant region of its system, similar to the area between Jupiter and Uranus in our own Solar System. There, the planet would have accumulated ices rich in methane and heavy elements, giving its atmosphere a distinctive chemical signature.

This discovery changes scientists’ perspectives and calls existing models of exoplanet atmospheric dynamics into question. "These results demonstrate powerful vertical mixing that we do not yet fully understand,” said Thomas Evans-Soma.

(MH with FM - Source: JAMA - Photo: © Unsplash)

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