The Wow! signal owes its name to the exclamation written on a paper printout from Ohio State’s Big Ear Radio Telescope in1972 that was evidence of a strange 72-second signal that stunned astronomer Jerry Ehman, and its lasting fame to the fact that it’s never been explained and never been picked up again. A recent paper claimed to have traced the signal to the star 2MASS 19281982-2640123 in the Sagittarius constellation 1800 light-years from Earth, but it’s still a theory. Now, another astronomer has proposed to have identified Wow! as leakage from a power beam propelling an extraterrestrial spacecraft. Time to drop the mic and yell “Wow!”?