New Research Reveals That Interstellar Comet 3I/ATLAS Formed in a System Far Colder Than Our Own

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This artist’s impression compares the semi-heavy water content of the interstellar comet 3I/ATLAS (left) and Earth (right). Credit: NSF/AUI/NSF NRAO/M.Weiss

The interplanetary comet 3I/ATLAS is remarkably rich in a specific type of water that contains deuterium, meaning it came from somewhere colder and with lower levels of radiation than our early Solar System.

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