You may be familiar with the famous “Wow!” signal. If you’re not familiar with the story, back in 1977, a radio telescope at Ohio State University detected a 72-second radio burst from space. Astronomer Jerry Ehman circled the printout with a red pen and wrote the word “wow!” beside it.

We’ve never heard such a signal again. There was no follow-up—just a one-time 72-second burst in a narrowband radiofrequency that has puzzled researchers for years. There have been theories, of course. And today, we get a brand-new one from our favorite Harvard astronomer—and the guy who thinks every inexplicable space occurrence is probably aliens—Avi Loeb.

I’ve written about him a lot recently, mostly because he’s fun and seems more hopeful than crazy. And if you guess that a mysterious space occurrence

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