Alien life may be hiding much closer to home than science fiction would have us believe, according to a particle physicist ...

One million alien visitors from another star system could already be lurking in the solar system. We aren't talking about "little green men" here, however — more "little (and not so little) gray rocks ...

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 ...

Here’s what you’ll learn when you read this story: Every time an interstellar object comes whizzing into our Solar System, it brings with it a certain intrigue. Where is it from? How did it form? Why ...

Life may not get blasted off any of the known "super-Earth" worlds as readily as it can from our planet, scientists find. The discovery suggests that any intelligent aliens that develop on such ...

Three researchers recently published a paper speculating about whether an object (likely a comet) could be "hostile" alien technology Scientists estimate the object to be more than 12-miles-wide, ...

Solar winds and coronal mass ejections may scatter narrow signals, making them harder for Earth-based telescopes to detect. The SETI Institute uses radio telescopes to search for signs of intelligent ...