A technical worker checks parts of the Shenzhou VIII at Jiuquan Satellite Launch Center in Northwest China's Gansu province, Oct 29, 2011. China will launch its unmanned spacecraft Shenzhou VIII early Tuesday for the country's first space docking. The center held a launching simulation on Saturday. [Photo/chinadaily.com.cn]

Engineers work during a launching simulation of China's unmanned spacecraft Shenzhou VIII at Jiuquan Satellite Launch Center in Northwest China's Gansu province, Oct 29, 2011. [Photo/chinadaily.com.cn]