Interstellar Comet 3I/ATLAS Carries Methane with Record-Breaking Heavy Hydrogen

Nov 4, 2026 - 15:00
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Interstellar Comet 3I/ATLAS Carries Methane with Record-Breaking Heavy Hydrogen
Hubble captured this image of 3I/ATLAS on July 21, 2025, when the comet was 446 million km (277 million miles) from Earth. Image credit: NASA / ESA / David Jewitt, UCLA / Joseph DePasquale, STScI.

Astronomers using the NASA/ESA/CSA James Webb Space Telescope have detected the most deuterium-rich methane ever measured in the Solar System, hinting that the interstellar visitor’s ices formed in a cold, distant, low-metallicity environment.

The post Interstellar Comet 3I/ATLAS Carries Methane with Record-Breaking Heavy Hydrogen appeared first on Sci.News: Breaking Science News.

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