We may not have found aliens yet because we’ve barely begun looking

A new calculation compares the effort so far to exploring a hot tub’s–worth of Earth’s oceans

Arecibo radio telescope

IS ANYBODY OUT THERE?  The Arecibo radio telescope in Puerto Rico has been used for decades in the search for extraterrestrial intelligence (SETI) but has barely made a dent in the space to be searched, new calculations suggest.

Courtesy of the NAIC-Arecibo Observatory, an NSF facility

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