As the only current U.S. senator to have visited space, Mark Kelly knows something about unexplained objects in the skies.
Back in his aviator days, Kelly saw Mylar party balloons fly by his cockpit. And once when he was piloting a NASA aircraft, he spotted an object at roughly 45,000 feet (13,700 meters) — much higher than commercial airplanes fly — that he couldn’t identify by sight.
