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 ...

NASA’s James Webb Space Telescope has detected methane gas in the coma of comet 3I/ATLAS, marking the first time this ...

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

Comet 3I/ATLAS arrived from beyond the Solar System carrying a chemical story unlike anything astronomers had measured before ...

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.

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