America army is making ready to release its secretive X-37B house aircraft on a 7th challenge in orbit.The uncrewed car, which resembles a miniature house travel, is slated to raise off Sunday from NASA’s Kennedy House Heart in Florida all over a 10-minute release window that opens at 8:14 p.m. ET. For the primary time, the X-37B will experience into orbit atop a SpaceX Falcon Heavy rocket.Since its debut greater than a decade in the past, the X-37B has been a supply of intrigue throughout the house group, most commonly owing to the mysterious nature of its actions in low Earth orbit. In spite of no longer understanding its true function or location, skywatchers have from time to time noticed and photographed the gap aircraft within the evening sky the usage of telescopes.The U.S. House Pressure generally does no longer divulge the categorized sides of X-37B missions. As such, little is understood in regards to the kinds of actions the robot car carries out in orbit.For this upcoming flight, dubbed OTV-7, the X-37B will behavior more than a few exams, together with “experimenting with house area consciousness applied sciences and investigating the radiation results to NASA fabrics,” consistent with the House Pressure.At the X-37B’s ultimate challenge, which spanned 908 days in orbit, the gap aircraft lifted off aboard a SpaceX Falcon 9 rocket. Ahead of that, the car rode to house 5 occasions on United Release Alliance’s Atlas V rockets. The Falcon Heavy booster is considerably extra robust than each, permitting the X-37B to function in “new orbital regimes,” House Pressure officers mentioned in a commentary.It’s no longer identified how lengthy the X-37B will stay in house, or the place and at what altitude it’s going to in the long run orbit.The army is tight-lipped about such operations, however the House Pressure mentioned the X-37B missions “are key to making sure protected and accountable operations in house for all customers of the gap area.”“This 7th flight of the X-37B continues to show the cutting edge spirit of america House Pressure,” Air Pressure Secretary Frank Kendall mentioned in a commentary.The mini house aircraft used to be constructed via Boeing and measures about 29 toes lengthy. Like NASA’s house shuttles, the X-37B is designed to go back to Earth and land on a runway.The car introduced on its first challenge in 2010 and has since logged 3,774 days in orbit over six flights.On earlier outings, House Pressure officers mentioned the X-37B’s civilian science experiments incorporated exams of generation to harness solar power and transmit energy to the bottom, in addition to experiments on how natural fabrics fare when uncovered to the surroundings of house for lengthy classes of time.This newsletter used to be initially printed on NBCNews.com