Nearly 50 years ago, astronomers searching the cosmos for evidence of intelligent extraterrestrial life detected a strong radio signal emanating from deep space. Today, scientists still aren’t sure where—or what—the Wow! Signal came from. It remains one of the most perplexing phenomena in the history of radio astronomy.

A new study has brought scientists closer than ever to solving that mystery. Researchers from the Arecibo Wow! (AWOW) project at the Arecibo Observatory in Puerto Rico recently re-analyzed the signal and decades of unpublished observations that followed its detection. The findings, submitted to The Astrophysical Journal for peer review on August 14 and currently available on the preprint server arXiv , significantly revise the Wow! Signal’s parameters and provide the mos

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