Nobody believes it was ET phoning, but radio astronomers admit they don’t have an explanation yet for a beam of radio waves that apparently came from the direction of the star Proxima Centauri.

“It’s some sort of technological signal. The question is whether it’s Earth technology or technology from somewhere out yonder,” said Sofia Sheikh, a graduate student at Pennsylvania State University leading a team studying the signal and trying to decipher its origin. She is part of Breakthrough Listen, a $100 million effort funded by Yuri Milner, a Russian billionaire investor, to find alien radio waves. The project has now stumbled on its most intriguing pay dirt yet.

Proxima Centauri is an inviting prospect for “out yonder.”

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