Measurements of this interstellar comet’s molecular makeup show an excess of heavy water molecules that is dramatically ...

Interstellar comet 3I/ATLAS will soon reach its closest distance to Earth, so this may be our last, best chance to see this rare object before it heads back out into the universe, never to return.

Less than a year ago, astronomers discovered a comet soaring through our sky that was not from our solar system. Although we ...

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

3I/ATLAS is not just another comet drifting by. This object likely formed around another star, may be older than our Sun, and ...

Scientists and NASA officials insist the object is a natural comet, not alien technology. Recent observations found no radio signals from the comet that would suggest it was artificial. The comet made ...

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

Astronomers say that there are possible signs of life on Comet 67P, based on data from the European Space Agency's Philae Lander. The comet has features that indicate it may be home to alien life, ...

Space scientists have released a new image of the enigmatic space rock that traveled through our solar system. Researchers revealed the photograph shows the interstellar Comet 3I/ATLAS - speculated to ...

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