
Alien megastructures would likely self-destruct before we spot them
An artist’s impression of a Dyson sphere Aicrovision/Shutterstock If advanced alien civilisations are building vast satellite swarms designed to harvest a star’s energy, we should be able to see them – so why haven’t we? One answer might be that these structures, known as Dyson spheres, will likely destroy themselves before we can spot one,…