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

For decades, scientists have searched the skies for signs of extraterrestrial technology. A study from EPFL asks a sharp ...

Former US President Barack Obama says he has seen no evidence extra-terrestrials have made contact with Earth.

SIGNS of an alien planet that’s about the same size as Earth have been picked by up a Nasa telescope. Scientists say it might ...