Diagram of the Mengtian module
Module statistics
COSPAR ID2022-143A
Part ofTiangong space station
Launch date31 October 2022, 07:37:23.191 UTC [1][2]
Launch vehicleLong March 5B (Y4)
Mass~23,000 kg (51,000 lb)
Length17.9 m (59 ft)
Diameter4.2 m (14 ft)
Pressurised volume110m3
habitable: 32m3[3]

Mengtian (simplified Chinese: 梦天; traditional Chinese: 夢天; pinyin: Mèng Tiān; lit. 'Dreaming of the Heavens[4]'), officially the Mengtian laboratory cabin module (Chinese: 梦天实验舱), is a major module of the Tiangong space station. It was the second Laboratory Cabin Module launched, and the second module to extend the existing Tianhe core module of the station.


The second LCM, Mengtian, was launched in 31 October 2022. The Mengtian module is equipped with expanded in-orbit experiment capacity, including eight research cabins.[5] It provides a pressurized environment for researchers to conduct science experiments in freefall or zero gravity which could not be conducted on Earth for more than a few minutes. Experiments can also be placed on the outside of the modules, for exposure to the space environment, cosmic rays, vacuum, and solar winds. It has its own airlock.

The axial port of Mengtian is fitted with rendezvous equipment and will first dock to the axial port of Tianhe. A mechanical arm dubbed, as Indexing robotic arm, looking a sort of Lyappa arm used on the Mir space station then moves Mengtian module to a portside port of the TCM.[6][7][8] It is different from Lyappa as it works on a different mechanism. Lyappa arm is needed to control the pitch of the spacecraft and redocking in a different plane. But the indexing robot arm is used when docking is needed in the same plane. In addition to this arm used for docking relocation, the Chinarm on Tianhe module can also be used as a backup in place of Indexing robot arm.[9][10]

Indexing Robot Arm of Wentian

In addition to this, it will also carry a small 5 m (16 ft) long robotic arm like the Chinarm as a supplemental to that arm. It will be used for manipulating extravehicular payloads and its positioning accuracy is 5 times better than the Chinarm. Mengtian has standard adaptors (silver squares) to host the payloads.[11] There is also an adapter by which this arm can be grappled by the Chinarm it to work a single robotic arm like Orbiter Servicing Arm on Canadarms.[12]

Electrical power is provided by two steerable solar power arrays, which use photovoltaic cells to convert sunlight into electricity. Energy is stored to power the station when it passes into the Earth's shadow. Resupply ships will replenish fuel for LCM 2 for station-keeping, to counter the effects of atmospheric drag.


Mengtian was launched on 31 October 2022 at 07:37:23.191 UTC.[1][2] It was inserted into a low Earth orbit with an average altitude of 393 km (244 mi) at an orbital inclination of 42 degrees.[13][14]

See also


The Shenzhou 14 mission to the space station assists with setting up the Mengtian module in orbit.[15]


  1. ^ a b Jones, Andrew (31 May 2022). "Rocket to launch China's next space station module arrives at launch center". SpaceNews. Retrieved 1 June 2022.
  2. ^ a b "SCIO briefing about China's progress on space station construction |". Retrieved 2022-04-18.
  3. ^ 中国载人航天 (2022-10-30). "解码梦天(二)一组数字看懂梦天实验舱" (in Simplified Chinese). Retrieved 2022-10-31.
  4. ^ "Planned space station details made public". China Daily. 2018-04-26. The two space labs, Wentian, or Quest for Heavens, and Mengtian, or Dreaming of Heavens
  5. ^ Ling, Xin (12 October 2022). "China's space station prepares for new frontiers of science with launch of Mengtian module". South China Morning Post.
  6. ^ Graham, William; Gebhardt, Chris (April 28, 2021). "China readies launch of Tianhe module, start of ambitious two-year station construction effort". This means the two future science modules, Wentian ("Quest for the heavens") and Mengtian ("Dreaming of the heavens"), cannot dock directly to their planned radial port locations. [...] To account for this, each module will carry a Russian Lyappa robotic arm — like the ones used on Mir for the same purpose — to move the module from the forward port to its respective permanent location on a radial port of Tianhe's docking hub.
  7. ^ Hong Yang (2020). Manned Spacecraft Technologies. Singapore: Springer. ISBN 978-9811548970.
  8. ^ Graham, William; Gebhardt, Chris (April 28, 2021). "China readies launch of Tianhe module, start of ambitious two-year station construction effort".
  9. ^ Hong Yang (2020). Manned Spacecraft Technologies. China: Springer. p. 355. ISBN 978-9811548970.
  10. ^ Graham, William; Gebhardt, Chris (April 28, 2021). "China readies launch of Tianhe module, start of ambitious two-year station construction effort".
  11. ^ Twitter Retrieved 2022-07-23. ((cite web)): Missing or empty |title= (help)
  12. ^ Twitter Retrieved 2022-07-23. ((cite web)): Missing or empty |title= (help)
  13. ^ Barbosa, Rui C. (1 March 2021). "China preparing to build Tiangong station in 2021, complete by 2022". NASASpaceFlight. Retrieved 15 March 2021.
  14. ^ David, Leonard (7 March 2011). "China Details Ambitious Space Station Goals". Retrieved 23 February 2012.
  15. ^ "Completion of the Heavenly Palace: Tiangong in 2022 - Dongfang Hour". 4 February 2022.