When a faint green smudge appeared in images from a backyard telescope in Aguadilla, Puerto Rico, on Nov. 22, 2025, astronomers did not expect it to upend basic assumptions about how comets work. Yet ...

The official UN/IAWN document confirms the interstellar comet 3I/ATLAS is the target of a formal planetary-defence exercise.

A new pre-print paper suggests that our latest interstellar visitor, comet 3I/ATLAS, may be headed for one final close ...

Boeing's infamous Starliner could launch again in 2026 on a NASA mission to the International Space Station. But this time, ...

It was soon deduced that this is an interstellar comet, meaning it has come from another solar system. It’s only the third ...

The interstellar comet 3I/ATLAS challenges physics with a missing dust tail, a forward anti-tail, and strange composition.

Interstellar comet 3I/Atlas has moved within 300 million km of Earth as scientists continue tracking its rare journey.

Traveling at a blistering 130,000 miles per hour through the solar system, interstellar comet 3I/ATLAS has become the focus ...

There have been several findings and fresh observations of the interstellar comet in recent days. Here are some of the ...

NASA will host a live event at 3 p.m., Wednesday, November 19, to share imagery of the interstellar comet 3I/ATLAS.

The fractured comet C/2025 K1 (ATLAS) is now visible to skywatchers after breaking into multiple large pieces following a ...

NASA has released images of interstellar comet 3I/ATLAS captured by Mars missions, revealing rare details about its composition and origins.