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Interstellar comet gave scientists their first taste of alien water

In late 2025, astronomers spotted an interstellar comet making a quick trip through the solar system. 3I/ATLAS was discovered ...
Scientific American

Alien comet reveals our solar system is the oddball

Measurements of this interstellar comet’s molecular makeup show an excess of heavy water molecules that is dramatically different from anything known to have ever formed around our sun ...