The launch took place at 14:22 local time (06:22 GMT).
The laboratory module Wentian consists of three parts: the working compartment, the airlock compartment, and the resource compartment. As of now, Wentian, which is 17.9 meters (55.7 feet) long, has a maximum diameter of 4.2 meters and a launch weight of 23 tons, is the largest spacecraft launched by China.
The Mengtian research module is also expected to dock to the Tiangong station this year.