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

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

The presence of deuterium, an isotope of hydrogen, in 3I/ATLAS suggests the interstellar comet formed in a much colder place ...

The astronomer used the Atacama Large Millimeter/submillimeter Array (ALMA) in Chile to make the observations.

CAPE CANAVERAL, Fla.(AP) — A stray comet from another star swings past Earth this week in one last hurrah before racing back toward interstellar space. Discovered over the summer, the comet known as ...

A cool interstellar comet that for millions of years has drifted in the spaces between our stars is now back in our telescope viewing range and will make its closest approach to Earth this week. We’re ...

Today is the day that astronomers, amateur stargazers and alien conspiracy theorists alike have been waiting for: interstellar comet 3I/ATLAS is as close to Earth as it will ever get. But lest you ...

Our visitor from deepest space is now departing from whence it came. Last Friday, the interstellar comet designated 3I/ATLAS completed its closest approach to Earth without crashing into us or ...

When comet 3I/ATLAS swept past the Sun in late October 2025, it gave astronomers their best chance yet to taste the chemistry ...