China's mysterious orbital space plane may be similar to the U.S. Space Force's robotic X-37B, seen here in a 2009 photo. The latest orbital mission of China's mysterious space plane may be nearing its end. The hush-hush vehicle, which launched to Earth orbit on Aug. 4, ejected something on Monday (Oct. 31), according to astrophysicist and satellite tracker Jonathan McDowell, of the Harvard-Smithsonian Center for Astrophysics. The newly released object "may be a service module, possibly indicating an upcoming deorbit burn," McDowell, of the Harvard-Smithsonian Center for Astrophysics, said via Twitter (opens in new tab) on Monday. Related: The latest…