The third known visitor from another star system, Comet 3I/ATLAS, has been racing through the Solar System with just enough ...

Billions of years ago, while the solar system was still young, a massive object may have drifted into it. It's not a spaceship, but it is an alien visitor in its own right—a colossal interstellar body ...

Scientists baffled as 3I/ATLAS displays sun-locked jet with odds of natural alignment near zero As the winter solstice approaches, Earth is preparing for a brush with a high-speed traveller from the ...

A recent theory proposed by a NASA scientist suggests that extraterrestrial civilizations may not possess the wildly advanced technology that many UFO enthusiasts expect. This perspective, which ...

Why are aliens always such a cliche? This one is a mockup of the Roswell Alien from the Museum of Science’s new exhibit, “The Science of Aliens,” which opens Sunday. Click through for more images, ...

Is 3I/ATLAS a comet or an alien ship? Harvard's Avi Loeb warns of a 'serial killer' visitor as the interstellar object makes its closest approach to Earth.