Chinese astronauts and scientists attend a dialog between them and local students in south China's Hong Kong, Aug. 12, 2012. Tiangong-1/Shenzhou-9 space mission delegation comprising of Chinese astronauts and scientists shared their knowledge and experience concerning aerospace with some 500 students from eight Hong Kong universities on Sunday. (Xinhua/Liao Zida)

Shenzhou-9 astronaut Liu Wang speaks in Chinese University of Hong Kong (CUHK), south China's Hong Kong, Aug. 12, 2012. Tiangong-1/Shenzhou-9 space mission delegation comprising of Chinese astronauts and scientists shared their knowledge and experience concerning aerospace with some 500 students from eight Hong Kong universities on Sunday. (Xinhua/Liao Zida)

Chinese astronauts and scientists pose for group pictures with local students in south China's Hong Kong, Aug. 12, 2012. Tiangong-1/Shenzhou-9 space mission delegation comprising of Chinese astronauts and scientists shared their knowledge and experience concerning aerospace with some 500 students from eight Hong Kong universities on Sunday. (Xinhua/Liao Zida)

Shenzhou-9 astronaut Liu Yang (R) speaks with Joseph Jao-Yiu Sung, Chancellor of Chinese University of Hong Kong (CUHK), in south China's Hong Kong, Aug. 12, 2012. Tiangong-1/Shenzhou-9 space mission delegation comprising of Chinese astronauts and scientists shared their knowledge and experience concerning aerospace with some 500 students from eight Hong Kong universities on Sunday. (Xinhua/Liao Zida)

Shenzhou-9 astronaut Jing Haipeng (L) shakes hands with a local student, in south China's Hong Kong, Aug. 12, 2012. Tiangong-1/Shenzhou-9 space mission delegation comprising of Chinese astronauts and scientists shared their knowledge and experience concerning aerospace with some 500 students from eight Hong Kong universities on Sunday. (Xinhua/Liao Zida)

Chinese astronauts and scientists communicate with local students in south China's Hong Kong, Aug. 12, 2012. Tiangong-1/Shenzhou-9 space mission delegation comprising of Chinese astronauts and scientists shared their knowledge and experience concerning aerospace with some 500 students from eight Hong Kong universities on Sunday. (Xinhua/Liao Zida)

Chinese astronauts and scientists present gifts to Chinese University of Hong Kong (CUHK) in south China's Hong Kong, Aug. 12, 2012. Tiangong-1/Shenzhou-9 space mission delegation comprising of Chinese astronauts and scientists shared their knowledge and experience concerning aerospace with some 500 students from eight Hong Kong universities on Sunday. (Xinhua/Liao Zida)

Chinese astronauts and scientists communicate with local students in south China's Hong Kong, Aug. 12, 2012. Tiangong-1/Shenzhou-9 space mission delegation comprising of Chinese astronauts and scientists shared their knowledge and experience concerning aerospace with some 500 students from eight Hong Kong universities on Sunday. (Xinhua/Liao Zida)