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

A Harvard University astrophysicist has sparked a furious debate by warning he cannot rule out that extraterrestrials are ...

The universe is so vast that the existence of aliens seems guaranteed. So why haven’t we heard from extraterrestrial civilisations or detected their presence? The contradiction between the high ...

KILLER alien jellyfish may be lurking in the water — near Jupiter. Experts say conditions are perfect for the fearsome floating stingers, which may be weirder and deadlier than our ones. Scientists ...

Alien activity, a fetish for cat whiskers and revenge on an ex-lover are just some of the bizarre reports wasting investigators time in the hunt for the vicious Croydon cat killer. RSPCA chief ...

"Killer shrimp" top the list of the 10 worst alien invaders of Britain's waterways which officials say are costing billions of pounds to tackle. Several species of pond plant which have escaped from ...