When comet 3I/ATLAS swept through the inner solar system in late 2025, it gave astronomers something no interstellar visitor ...

A rare comet from another star system is revealing just how different alien solar systems may be from our own.

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A mysterious comet from beyond our solar system is giving astronomers a rare glimpse into alien worlds — and it may have ...

Astronomers at the University of Michigan have found that the interstellar comet 3I/ATLAS contains water with a deuterium ...

Historic Martian snapshot: Perseverance rover imaged comet 3I/ATLAS from Mars, marking the first surface-based photo of an interstellar object from another planet. Cold cosmic origins: ALMA ...

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Scientists have found unusually high heavy water levels in interstellar comet 3I/ATLAS. The finding suggests it formed in a much colder region and shows planetary systems can arise in very different ...

The interstellar comet 3I/ATLAS changed significantly as it flew by the sun last fall, astronomers have discovered.