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

HBO Max just added the Alien movie special editions to celebrate Alien Day; here are all the major differences between the ...

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 ...

Europe is quietly positioning itself to attempt one of the most audacious missions in planetary exploration: a dedicated landing on Enceladus to look directly for signs of alien biology. Instead of ...

The extra terrestrial encounter happened during Science Week with the children setting up their own X Files to investigate the crash site and UFO. Pupils arrived to discover scattered clues, strange ...