Astronomers have detected unusual radio signals from a distant star system that repeat in a regular pattern every 157 days. The signals have characteristics that distinguish them from known natural phenomena such as pulsars or magnetars. Natural cosmic events typically produce either random signals or patterns explainable by physics, but these signals show a complexity that does not match any known natural source. The star system contains a planet in the habitable zone where liquid water could exist. Some scientists have suggested these signals could be evidence of extraterrestrial intelligence attempting to communicate. We should direct our most powerful telescopes toward this system to investigate further.