The unusual trajectory of interstellar comet 3I/ATLAS has sparked speculation that it could be an alien spacecraft.

When astronomers spotted a glowing object racing through the solar system earlier this year, some wondered if it could be an ...

Two ESA spacecraft, Hera and Europa Clipper, are poised to fly through the long tail of interstellar comet 3I/ATLAS, a new ...

Comet 3I/ATLAS is warming up as it approaches the sun, causing a jet to emerge. The jet is visible in a dramatic new image.

Short-period comets get close to the sun much more often than their long-period kin, and every time they do, they deplete ...

A leading US astrophysicist has warned that an alien attack could be imminent, claiming a mysterious object hurtling through our solar system may be an ...

New telescope images show that the interstellar comet 3I/ATLAS is shooting a giant jet of gas and dust toward the sun. This ...

A cosmic coincidence could give us an unprecedented look at a visitor from another solar system. If all goes well.

Avi Loeb has become a familiar figure in news coverage about 3I/ATLAS because of his startling theory that the comet could be ...