The 8.5-metric-ton Tiangong 1 (it means "heavenly palace") is slated to stay in orbit for two years. During that time, China will launch three missions to rendezvous with the orbital lab. Shenzou 8 and Shenzou 9, launching in November and early in 2012 respectively, will be unmanned missions meant to test various rendezvous and docking technologies. Shenzou 10, also slated for sometime in 2012, could be a manned mission if the first two go smoothly. It could also carry China's first female astronaut, Chinese space officials said.