Add Yahoo as a preferred source to see more of our stories on Google. In a series of papers, astronomers have compared the "Wow!" signal to similar radio signals detected at Big Ear Observatory in ...

The first unmistakable signal from another intelligence may not be a cheerful greeting. A growing group of researchers is arguing that our inaugural contact is more likely to be a distress call, the ...

RATHER than transmitting radio messages, extraterrestrial civilisations would find it far more efficient to send us a “message in a bottle” – some kind of physical message inscribed on matter. And it ...

Scientists have issued a new blueprint for the day Earth receives a message from an alien civilization. Released Friday, the eight-point plan lays out how researchers should handle a potentially world ...

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 ...