So far no one has found evidence of intelligent aliens elsewhere in the cosmos. But if they do exist, they might be hanging out on Dyson spheres circling the husks of sunlike stars called white dwarfs scattered throughout the Milky Way, a new paper argues.

And that’s there we should be focusing our search for extraterrestrials, study co-author Ben Zuckerman, an emeritus professor of physics and astronomy at the University of California Los Angeles, told Live Science in an email.