Wentian is the first Laboratory Cabin Module (LCM) and second major component of the Chinese spacestation. It will provide additional navigation avionics, propulsion and orientation control as backup functions for the Core Cabin Module (CCM) as well as a pressurized environment for researchers to conduct science experiments in zero gravity.

The configuration of the CZ-5B variant consists of the Long March 5 core stage with its four strapped-on liquid-fueled boosters, but the usual second stage will be absent; in place of the second stage would be heavier low earth orbit payloads.

The China Aerospace Science and Technology Corporation (CASC) is the main contractor for the Chinese space program. It is state-owned and has a number of subordinate entities which design, develop and manufacture a range of spacecraft, launch vehicles, strategic and tactical missile systems, and ground equipment. It was officially established in July 1999 as part of a Chinese government reform drive, having previously been one part of the former China Aerospace Corporation. Various incarnations of the program date back to 1956.

• Tiangong space station

  Human Spaceflight
  The Tiangong space station is a space station placed in Low Earth orbit between 340 and 450 km above the surface.
  Program wiki