U.S. Space Force’s X-37B space plane keeps extending its flight-duration record, mysteriously orbiting around the Earth for 900 days, according to reports. The reusable Boeing space plane is flying its sixth mission, known as Orbital Test Vehicle-6 or OTV-6, which was initially launched from Cape Canaveral Space Force Station in Florida on May 17, 2020. Nobody knows when the top-secret mission is...