Photo taken on June 24, 2013 shows the screen at the Beijing Aerospace Control Center showing astronauts Nie Haisheng (C), Zhang Xiaoguang (R) and Wang Yaping saluting in Tiangong-1 space lab module. Chinese President Xi Jinping came to the Beijing Aerospace Control Center Monday morning to talk with the astronauts aboard Tiangong-1. (Xinhua/Li Tao)

Photo taken on June 24, 2013 shows the screen at the Beijing Aerospace Control Center showing astronauts Nie Haisheng (C), Zhang Xiaoguang (R) and Wang Yaping saluting in Tiangong-1 space lab module. Chinese President Xi Jinping came to the Beijing Aerospace Control Center Monday morning to talk with the astronauts aboard Tiangong-1. (Xinhua/Li Tao)