The graphics shows the procedures of Tianzhou-1 automated docking with Tiangong-2 on April 22, 2017. (Xinhua/Lu Zhe)

Photo taken on April 22, 2017 shows the Tianzhou-1 cargo spacecraft moving towards the orbiting Tiangong-2 space lab for the automated docking on a screen at Beijing Aerospace Control Center in Beijing, capital of China. The Tianzhou-1 cargo spacecraft, China's first cargo spacecraft, which was launched Thursday evening from Wenchang Space Launch Center in south China's Hainan Province, successfully completed automated docking with the orbiting Tiangong-2 space lab at 12:23 p.m. Saturday, according to Beijing Aerospace Control Center. It is the first docking between the spacecraft and space lab. (Xinhua/Wang Sijiang)

Technical personnel work at Beijing Aerospace Control Center to monitor the automated docking between Tianzhou-1 cargo spacecraft and Tiangong-2 space lab in Beijing, capital of China, April 22, 2017. The Tianzhou-1 cargo spacecraft, China's first cargo spacecraft, which was launched Thursday evening from Wenchang Space Launch Center in south China's Hainan Province, successfully completed automated docking with the orbiting Tiangong-2 space lab at 12:23 p.m. Saturday, according to Beijing Aerospace Control Center. It is the first docking between the spacecraft and space lab. (Xinhua/Yu Tao)