Two surveys of hundreds of thousands of stars in our galaxy have revealed mysterious spikes in infrared warmth coming from dozens of them. Astronomers say this may very well be proof for alien civilisations harnessing vitality from their stars by utilizing an unlimited development often called a Dyson sphere – though they will’t totally rule out extra mundane explanations.

First proposed within the Sixties, Dyson spheres are hypothesised buildings that would encompass total stars to soak up their vitality, a…