Add Yahoo as a preferred source to see more of our stories on Google. A year ago, a mysterious signal was transmitted from Mars. And a father-daughter duo has finally cracked this extraterrestrial ...

The first unmistakable signal from another intelligence would rank alongside fire and writing in the story of our species, yet a growing group of researchers warns that such a moment might arrive not ...

Could alien signals have already reached Earth undetected? - If advanced alien civilisations exist and have contacted Earth, ...