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Interstellar Comet 3I/ATLAS Came From an Extremely Cold, Lonely Region of the Milky Way Galaxy, New Research Suggests

Scientists said the comet contains unusually high deuterium, a chemical clue that points to formation in an extremely cold, isolated part of the Milky Way.

Summary by Smithsonian Mag
Astronomers analyzed the vapors coming off the comet when it neared the sun and found it had a lot of "heavy" water. That hints it grew up in a frigid planetary system, possibly before its home star formed

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NBC Miami broke the news in Miami, United States on Sunday, April 26, 2026.
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