The Air Force’s X-37B Orbital Test Vehicle after successfully landing at NASA’s Kennedy Space Center Shuttle Landing Facility Oct. 27, 2019. (Courtesy photo)
CAPE CANAVERAL, Fla. (AP) — The U.S. military’s mystery space plane rocketed into orbit again Sunday, this time with an extra load of science experiments.It’s the sixth flight of an X-37B, a solar-powered plane that's flown by remote control without a crew.Officials aren't saying how long the spacecraft will remain in orbit this time or the purpose of the mission. But a senior vice president for X-37B developer Boeing, Jim Chilton, noted each mission has been progressively longer.The previous mission lasted a record two years, with a touchdown shrouded in darkness at NASA's Kennedy Space Center last year.The winged spacecraft resembles NASA’s old shuttles, but is just one-quarter the size at 29 feet (9 meters) long. The one just launched features an extra compartmen
