Astronomers discovered a comet passing through our solar system in July 2025 carrying organic molecules formed in a distant star system—the third interstellar object ever confirmed—and evidence now suggests this ancient traveller may have spent billions of years wandering the galaxy before we spotted it.
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3I/ATLAS carried methanol, hydrogen cyanide and methane from beyond our solar system. Its speed and isotopes suggest an ancient origin, but not a dated journey.
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