Astronomers studying interstellar comet 3I/ATLAS say isotope measurements point to an origin in a very cold, ancient planetary system. The object may have formed 10 billion to 12 billion years ago, before the 4.5-billion-year-old Solar System existed. The findings, published June 22 in Nature, draw on observations by the James Webb Space Telescope and the ALMA observatory in Chile. 3I/ATLAS is the third confirmed interstellar object detected passing through the Solar System, after 1I/’Oumuamu...

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