China's space program just hit a milestone: according to Reuters, its first cargo probe has successfully proven that it can ferry supplies to orbit. Tianzhou-1 took off from the Wenchang Satellite Launch Center in the mainland on April 20th. In the early hours of April 22nd, Eastern time, it performed an automated docking maneuver to attach itself to the country's orbiting lab, the Tiangong-2. You can think of Tiangong 2 (or "Heavenly Space Lab") as China's experimental space station, which housed two astronauts for a month in October 2016. The country is using it to test new technologies for the larger manned space station that it hopes to establish in orbit by 2022.