Shenzhou-8 spacecraft is ready to dock with Tiangong-1 space lab module after five swing-bys after its launch in early Tuesday morning, a command and control center said Wednesday. The unmanned spacecraft, controlled and guided by the Beijing Aerospace Flight Control Center, arrived, at 5:05 p.m., at somewhere in space 52 km down behind the target modular orbiter, preparing for China\'s first space docking mission on a low earth orbit.