Measurements of this interstellar comet’s molecular makeup show an excess of heavy water molecules that is dramatically different from anything known to have ever formed around our sun ...

A rare comet from another star system is revealing just how different alien solar systems may be from our own.

A young planetary system located only 10.5 light-years away has a structure remarkably similar to Earth's solar system, a new study shows. Using NASA's Stratospheric Observatory for Infrared Astronomy ...

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 ...

A huge object, possibly as big as Manhattan, has entered our Solar System and it might be more than just a rock. Some scientists now say it could be an alien spacecraft, with plans to attack Earth in ...

Scientists are looking into the possibility that 'alien spaceship' 3I/ATLAS could have come from within our own solar system. This would challenge the belief that the comet was an "interstellar object ...

Add Yahoo as a preferred source to see more of our stories on Google. Astronomers have trained telescopes on planets outside our solar system - and light years away from us. But there might be a ...

The universe is at it again; scientists have been baffled by a discovery that turns all the knowledge they have on planetary systems on its head. Scientists have discovered an alien solar system ...

They are often depicted as either little green men, bug-eyed creatures or terrifying monsters intent on wiping out all life on Earth. But if aliens do exist, what might they actually look like?