The moment of first contact with extraterrestrials is a staple of science fiction. It usually involves a frantic scientist ...

Astronomers swept millions of candidates and found no alien signals from K2-18b, setting the first power limit on any ...

There were no 'technosignatures' from comet 3I/ATLAS, the third known object from a faraway star The group leading the charge ...

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 ...