Shenzhou 7 blasts off on a Long March II-F carrier rocket from the Jiuquan Satellite Launch Center in the northwestern Gansu province at 9:10 pm on Sept. 25, 2008, with three astronauts on board to attempt the country's first-ever space walk. Onboard pilots Zhai Zhigang, Liu Boming and Jing Haipeng orbited the Earth for four days, and one of them floated out of the cabin 343 kilometers above the earth. [Photo/81.cn]