Former Pentagon UFO investigator Luis Elizondo claims the US government possesses unreleased photographs showing what appear ...

Scientists have identified new clues that could help astronomers spot one of the most famous hypothetical alien ...

Cropped image of NASA’s James Webb Space Telescope observation of comet 3I/ATLAS with its Near-Infrared Spectrograph ...

A strange class of comet could explain the enigmatic behavior of ‘Oumuamua, the first known interstellar object—and even shed ...

Eventually, we'll launch a mission dedicated solely to studying an interstellar object. When that day comes, which one should ...

Last year, an interstellar traveler entered our solar system. Some speculated that it was an alien spacecraft, but it turned ...

The interstellar comet is a fossil from a planetary system that formed a long time ago in an area of our galaxy far, far away.

The Australian Space Agency says the objects "appear to be pressure vessels from a space launch vehicle" that recently ...

Comets have played an interesting role in the history of astronomy. Since antiquity, many cultures saw them as omens or ...

The question of whether humanity is alone in the universe has fascinated scientists for generations, but few have pursued an ...

Avi Loeb, Harvard astrophysicist known for bold alien theories, will lead a Trump administration-backed team investigating UFOs and their security risks.

Interstellar comet 3I/ATLAS, the third known object to enter our solar system from another star, underwent a dramatic ...