Webb telescope spots CO2 on exoplanet for first time: What it means for finding alien life

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Webb telescope spots CO2 on exoplanet for first time: What it means for finding alien life
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Report heralds what’s to come from the landmark observatory, which is set to explore 76 worlds during its first year.

Researchers detected carbon dioxide in WASP-39b’s atmosphere when the exoplanet crossed in front of its star. The data plot shown represents the infrared wavelengths from the star’s light that were absorbed by carbon dioxide on the exoplanet, yielding a telltale blip.Then came Webb. For a little more than eight hours on 10 July, the infrared telescope observed the planet move across the face of its star.

“That’s where the story starts to get interesting,” Batalha says. It’s possible that when WASP-39b was young, it was bombarded with comets and asteroids, which could have delivered heavier elements such as carbon and oxygen. Interestingly, the exoplanet appears to have the same amounts of heavy elements as Saturn, which astronomers also think underwent a violent youth.

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