The Dyson sphere is a hypothetical artificial structure proposed by physicist Freeman Dyson in 1960, which would cover a star with a structure and directly harness its energy. However, no matter how ...

Across the observable universe, galaxies advertise themselves in radio waves for familiar reasons-magnetic fields, cosmic rays, and, in those cases where it’s relevant, matter spiraling into a central ...

If so, why haven’t they said hello? The humble residents of this pale blue dot have been on a quest to find an alien civilisation for more than a century. First, it was the “canals” of Mars. Then ...