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JWST reveals 3I/ATLAS's coma is largely carbon dioxide

The James Webb Space Telescope detected 3I/ATLAS's coma with an 8:1 carbon dioxide to water ratio, the highest ever recorded in a comet, indicating unusual sublimation processes.

Summary by Phys.org
All (or at least most) astronomical eyes are on 3I/ATLAS, our most recent interstellar visitor that was discovered in early July. Given its relatively short observational window in our solar system, and especially its impending perihelion in October, a lot of observational power has been directed toward it.

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Much has been written in the press during the last weeks of comet 3I/ATLAS, about the supposed uncertainty in its nature.The monitoring carried out with all kinds of instrumentation makes it the best interstellar object observed to date.And, despite the many elucebrations poured, both the images and the spectra of reflection clearly point to its cometary nature.It is in no case an extravagant object unknown to science.In fact, our research group…

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Phys.org broke the news in United Kingdom on Monday, September 1, 2025.
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