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在轨飞行近两年后,执行代号为“轨道试验飞行器”(OTV)4任务的美国空军X-37B无人驾驶航天飞机5月7日在佛罗里达州肯尼迪航天中心的原航天飞机着陆跑道上返航着陆。执行本次任务的X-37B是2015年5月20日由宇宙神5火箭在佛州卡纳维拉尔角空军站发射的。美空军在发射前曾披露说,OTV-4任务将携带由航空喷气发动机洛克达因公司研制的霍尔效应电推力器和
Nearly two years after its orbital flight, the U.S. Air Force X-37B unmanned spacecraft, code-named “Orbiter” (OTV) 4 mission, was to launch the shuttle’s landing shuttle at the Kennedy Space Center in Florida on May 7. On the return flight landing. The X-37B to perform this mission was launched on May 20, 2015 by the Cosmic God 5 rocket at the Cape Canaveral Air Force Station in Florida. Prior to launching, the U.S. Air Force disclosed that the OTV-4 mission will carry a Hall effect thruster developed by Lockhart’s jet jet engine company and