(Source: CGTN)

China's first cargo spacecraft, the Tianzhou-1, is all set to launch sometime between Thursday and Monday, when weather conditions are suitable.

Photo taken on April 17, 2017 shows the cargo spacecraft Tianzhou-1 being transferred with a Long March-7 Y2 carrier rocket from the testing center to the launch zone in Wenchang, south China's Hainan Province. China's first cargo spacecraft Tianzhou-1 is to be launched into space between April 20 and 24, according to the office of China's manned space program. (Xinhua/Ju Zhenhua)

The last comprehensive launch "rehearsal" went off without a hitch on Tuesday at the Wenchang Space Launch Center in Hainan province.  The Tianzhou-1 is a robotic supply vessel.  It will dock with the Tiangong-2 space lab three times to test in-orbit liquid propellant refueling.

The mission is a crucial step toward China's goal of establishing its own space station around 2022.