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The first laboratory module will provide additional navigation avionics, propulsion and [[Yaw, pitch and roll#Aircraft attitudes|orientation]] control as backup functions for the [[Tianhe Core Module]] (TCM). Both LCMs provide 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 wind]]s.
The axial port of the LCMs will be fitted with rendezvous equipment and will first dock to the axial port of the CCM. A mechanical arm dubbed, as Indexing robotic arm, looking a sort of [[Lyappa arm]] used on the Mir space station will then move the module to a radial port of the CCM.<ref>{{cite news |url=https://www.nasaspaceflight.com/2021/04/china-station-construction-begins/ |title=China readies launch of Tianhe module, start of ambitious two-year station construction effort |first1=William |last1=Graham |first2=Chris |last2=Gebhardt |date=April 28, 2021 |website=NASASpaceflight.com |quote=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.}}</ref> 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 where 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.<ref>{{Cite book |last=Hong Yang
In addition to this, both will also carry a small {{cvt|5|m}} long robotic arm like the Chinarm as a supplemental to that arm. It will be used for manipulating extravehicular payloads and their positioning accuracy is 5 times better than the Chinarm. There are standard adaptors (silver squares) on the modules to host the payloads.<ref>{{Cite web |url=https://twitter.com/cnspaceflight/status/1550846854123778049 |access-date=2022-07-23 |website=Twitter |language=en}}</ref> There is also an adapter by which one of these arms can be grappled by the Chinarm it to work a single robotic arm like [[Orbiter Servicing Arm]] with [[Canadarm]]s.<ref>{{Cite web |url=https://twitter.com/cnspaceflight/status/1543492387950931969 |access-date=2022-07-23 |website=Twitter |language=en}}</ref>
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==Dimensions==
The length of each module is 17.9 m. They are cylindrical with a maximum diameter of 4.2 m and an on-orbit mass of approximately {{convert|20,000|kg|lb|abbr=on}} apiece.<ref name="nsf-20210301" /><ref name = "天宫空间站关键技术特点综述">{{cite journal | last1 = 王 | first1 = 翔 | last2 = 王 | first2 = 为 | title = 天宫空间站关键技术特点综述 | journal = 中国科学: 技术科学 | volume = 51 | issue = 11 | date = 2021 | doi = 10.1360/SST-2021-0304 | language = zh | accessdate = 2021-11-13 | url = https://www.sciengine.com/publisher/scp/journal/SST/51/11/10.1360/SST-2021-0304?slug=fulltext}}</ref>
==Launch==
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