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 ...

Who hasn't looked into the sky and wondered if there's life out there, somewhere, looking back at us? Is it possible there's alien life closer to home — within the bounds of our solar system? The ...

Interstellar comet 3I/ATLAS dramatically brightened after passing the Sun, with Harvard astrophysicist Avi Loeb warning it ...

For millions of years, a frozen wanderer drifted between the stars before slipping into our solar system as 3I/ATLAS—only the ...

The Science: Europa has been considered as a top contender for alien life for even longer than Enceladus, thanks to its massive under-ice liquid water oceans. It also displays water vapor plumes ...

The interstellar visitor, only the third such object to be discovered passing through our solar system, ignited controversial ...

Object 3I/ATLAS is now too far from Earth to aim a telescope at, but prior observations showed some unusual behavior. The anomalous nature of the object led astrophysicist Avi Loeb to apply a thought ...

Some 70,000 years ago, when humans and Neanderthals shared the planet, an alien star streaked through the outer edges of our solar system and jostled its contents, astronomers say. In a study of ...

Scientists have discovered something that they previously thought wasn’t possible – an ‘inside out’ star system. When you line all the planets in our solar system up, the four closest to the sun are ...