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China is preparing to significantly expand its Tiangong space station, with plans that could more than double its current size. The move comes as the International Space Station approaches its planned retirement in 2031, potentially shifting the balance of long term research platforms in low Earth orbit.
The Tiangong space station is currently one of only two operational space stations, alongside the International Space Station. With demand for experiments and international collaboration growing, Chinese officials say additional modules are needed to support future missions, as reported by South China Morning Post.
The first step in the expansion will involve adding a fourth module to the station’s existing T shaped structure, transforming it into a cross shaped configuration. This module will include multiple docking ports and act as a hub for future additions, potentially leading to a six module station with a total mass of around 180 tonnes.
The current Tiangong station, completed in 2022, offers about 110 cubic meters of habitable space, roughly equivalent to a three bedroom apartment. It typically supports three astronauts but can accommodate up to six during crew rotations. Since becoming operational, it has hosted more than 260 scientific experiments and over two dozen astronauts.
New modules are expected to include additional laboratory space and a dedicated airlock for spacewalks, allowing for more complex operations and increased mission frequency. Engineers are also working on upgrades to supporting systems, including robotic arms designed to handle more advanced tasks.
To support these changes, China is enhancing its launch capabilities. The Long March 5B rocket is being upgraded with improved payload capacity, enabling it to carry larger modules into orbit. These upgrades are essential for assembling the expanded station in space.
The expansion also aligns with China’s efforts to broaden international participation. Astronauts from regions including Pakistan, Hong Kong, and Macau are expected to take part in future missions, while cooperation with the United Nations has already brought in international research payloads.
As the ISS nears the end of its operational life, Tiangong’s expansion could position it as a primary platform for orbital research. While no official timeline has been announced, the planned upgrades suggest a long term strategy to scale capabilities and meet increasing scientific demand.