NASA's Ingenuity helicopter has gone silent on Mars

NASA is trying to figure out how to reach its Ingenuity Mars helicopter after losing contact with the craft earlier this week. During its 72nd flight -- a "quick pop-up" to an altitude of about 40 feet -- NASA says Ingenuity stopped communicating with the Perseverance rover before it was meant to. It went quiet on Thursday, and as of Friday evening, NASA still hadn't heard from it. Ingenuity sends its data to Perseverance, which then passes it on to Earth. According to NASA, the small helicopter...