Earth" brought a shipload of xenomorphs and other space horrors, but hybrids may be the biggest mystery of the show so far.

Earth is dotted with humongous, human-made structures that, to an alien eye, may be tell-tale signs of intelligent goings-on.

"Most planetary systems appear as 'peas in a pod.' This is not the case in the TOI-201 system." ...

While scouring a 50-million-year-old crater on Mars, the Curiosity rover stumbled upon a polygon-shaped pattern that sort of ...

Satellite images have revealed some truly unsettling discoveries hiding in plain sight. Join us as we count down the ...