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](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2018/09/092718_lg_bathtub-aliens_feat.jpg?fit=860%2C460&ssl=1)
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