A comet from another star system does not arrive every year. That is part of what made 3I/ATLAS so compelling when it appeared in July 2025.

Astronomers studying the interstellar comet 3I/ATLAS say it could be a 12‑billion‑year‑old relic formed in near‑absolute‑zero ...

Researchers at the SETI Institute found no evidence of alien technology after analyzing radio signals from the object. 3I/ATLAS was the third comet ever discovered originating from outside our solar ...

SETI Institute's radio scans of interstellar comet 3I/ATLAS found no evidence of alien technology, confirming its natural origins.

PARIS, France — An interstellar comet that blazed past the Sun last year could be nearly three times older than our Solar ...

An interstellar comet that blazed past the sun last year could be nearly three times older than our solar system and is ...

Observations suggest comet spent billions of years on ‘vast unimaginable trajectories’ around our galaxy ...

Exactly where the comet 3I/ATLAS came from within the Milky Way remains a mystery.

Some trees are remarkable simply because of how long they have been standing. The monkey puzzle tree, known scientifically as ...