A comet from another star system is carrying water unlike anything astronomers have ever measured in our cosmic neighborhood.

A comet born around another star is carrying water unlike anything ever measured in our solar system. Observations of ...

An interstellar comet carries water unlike anything in our solar system, revealing a far colder birthplace and clues about ...

Interstellar comet 3I/ATLAS is even more extreme. The ratio of semi-heavy water to regular water is 30 times larger than in ...

ALMA reveals unusual “alien” water in interstellar comet 3I/ATLAS, showing it formed in an extremely cold, distant star ...

New observations of interstellar comet 3I/ATLAS show high levels of deuterated water, suggesting it formed in a colder star ...

This artist’s impression compares the semi-heavy water content of the interstellar comet 3I/ATLAS (left) and Earth (right).

A mysterious interstellar comet older than the Sun is exposing alien chemistry and rewriting astronomy as we know it.

Rare interstellar comet 3I/ATLAS is revealing clues about the early Milky Way, offering scientists a glimpse into conditions ...