Alien megastructures would likely self-destruct before we spot them

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

​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 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