Dyson spheres, a type of huge megastructure designed to capture the energy output of a star, would be a sign of an alien civilisation – if we can find one before they disappear

FX has set the premiere dates for The Bear season four, Noah Hawley’s Alien: Earth and Sterlin Harjo ’s The Lowdown starring Ethan Hawke.

Project Sigma, started in 1954, used a binary computer language sent along radio signals into space to make contact with alien life. Just five years after the interstellar connection, an official from the US Air Force met the extraterrestrials who ...