Tiangong space station facts for kids
![]() A rendering of the station with the Tianhe at centre of picture, a Tianzhou on its aft port, the Wentian on its starboard port to the left, the Mengtian on its portside port to the right and two Shenzhou spacecraft, sharing its multi-docking hub
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Station statistics | |
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Crew | Maximum: 6 Currently aboard: 3 (Shenzhou 18) Expedition: 7 Commander: Ye Guangfu (PLAAC) |
Launch | 29 April 2021 (Tianhe) 24 July 2022 (Wentian) 31 October 2022 (Mengtian) ~2026 (Xuntian) |
Launch pad | Wenchang Spacecraft Launch Site LC-1 |
Mission status | Operational |
Mass | ~ 100,000 kg |
Length | ~ 55.6 m |
Diameter | ~ 39.0 m |
Pressurised volume | 340 m3 (12,000 cu ft) Habitable: 122 m3 (4,310 cu ft) |
Perigee | 386.4 km |
Apogee | 391.8 km |
Orbital inclination | 41.47° |
Typical orbit altitude | 389.1 km |
Orbital speed | 7.67 km/s |
Orbital period | 92.3 minutes |
Days in orbit | 1526 days, 14 hours, 17 minutes (3 July 2025) |
Days occupied | 1395 days, 23 hours and 56 minutes (3 July 2025) |
Statistics as of 25 April 2024 | |
Configuration | |
![]() Station elements as of April 2024
(exploded view) |
The Tiangong (which means "Sky Palace" in Chinese) is a space station built by China. It is operated by the China Manned Space Agency. This station is made of different parts, called modules, that connect together in space. It orbits Earth between 340 and 450 kilometers (about 211 to 280 miles) above the surface.
Tiangong is China's first long-term space station. It is part of the Tiangong program. The station is a place for astronauts to live and work. They do many experiments in space. The station helps China learn more about science and technology. It is about one-third the size of the International Space Station.
Building the station used what China learned from its earlier test stations, Tiangong-1 and Tiangong-2. The first main part, the Tianhe ("Harmony of the Heavens"), was launched on April 29, 2021. After that, more missions sent astronauts and supplies. Two laboratory modules were added. The first, Wentian ("Quest for the Heavens"), launched on July 24, 2022. The second, Mengtian ("Dreaming of the Heavens"), launched on October 31, 2022.
Contents
What's in a Name?
The names for China's space program often come from ancient Chinese stories and myths. For example, the space capsule is called Shenzhou (Divine Vessel). The space station is named Tiangong, which means "Heavenly Palace." This name makes people think of beautiful, mystical places.
In 2013, the China Manned Space Agency (CMSA) announced the names for the space station and its parts:
- The first test space labs were called Tiangong (Sky Palace). Tiangong-1 and Tiangong-2 were launched in 2011 and 2016.
- The large space station we see today is also called Tiangong.
- The cargo spacecraft that carries supplies is called Tianzhou (Heavenly Ship).
- The main part of the station is the Tianhe (Harmony of the Heavens) Core Module.
- The first experiment module is Wentian (Quest for the Heavens).
- The second experiment module is Mengtian (Dreaming of the Heavens).
- A separate space telescope that will orbit near the station is called Xuntian (Touring the Heavens). It is planned for launch in 2026.
Why Build Tiangong?
The main goal of Tiangong is to learn how to live and work in space for a long time. It helps China practice connecting spacecraft in orbit. It also tests ways to keep astronauts healthy and supplied far from Earth.
The station is a platform for many important activities:
- Space Experiments: Scientists can do experiments in space that are impossible on Earth.
- Future Space Travel: It helps develop new technologies for future trips, even to deep space.
- New Ideas: China wants private companies to get involved. This could lead to new, cheaper ways to explore space.
- Space Tourism: Even space tourism is being considered for the future!
Scientific Research
The Tiangong space station has 23 special racks inside for experiments. There are also places outside the station for experiments to be exposed to space. Over 1,000 experiments are planned for the station.
One interesting area of research is agriculture in microgravity. Astronauts have grown rice and a plant called Arabidopsis thaliana. This helps scientists learn how to grow food for long space missions.
Experiments cover many fields, including:
- Space life sciences and biotechnology.
- How fluids and fire behave in microgravity.
- Material science (how materials change in space).
- Basic physics in microgravity.
Education and Outreach
The space station also helps teach and inspire young people. Astronauts give "space lectures" from orbit. They do science experiments that are shown to students in China and around the world. These lessons help get kids excited about science and technology.
The first space lessons from Tiangong happened in December 2021 and March 2022. This tradition has continued with later missions.
Amateur radio equipment on the station allows radio enthusiasts worldwide to talk to astronauts. This project aims to inspire students to pursue careers in science, technology, engineering, and math (STEM).
How Tiangong is Built
Tiangong is a "third-generation" modular space station. This means it's built in space from different parts launched separately. This design makes it more reliable and can save money. It also allows the station to be changed or expanded later.
Wentian robotic arm |
Chinarm robotic arm |
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Solar array | Solar array | Docking port | Solar array | Solar array | |||||||||||||||||||||||||||||||||||||||||
Wentian laboratory |
Tianhe core module |
Mengtian laboratory |
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Solar array | EVA hatch | Docking port | Docking port | Solar array | |||||||||||||||||||||||||||||||||||||||||
EVA hatch | Cargo airlock | ||||||||||||||||||||||||||||||||||||||||||||
Station Modules
The Tiangong station currently has three main modules. Future plans might add more modules to make the station even bigger.
- The Tianhe Core Cabin Module (CCM) is the main living area for three astronauts. It controls the station's direction and provides power, propulsion, and life support. It has a kitchen, toilet, computers, and communication equipment.
- The Wentian Laboratory Cabin Module (LCM) is the first experiment module. It has backup systems for the Tianhe module. It also has a special airlock for astronauts to go outside on extravehicular activities (EVAs), or spacewalks. Inside, there are racks for science experiments. It also has three extra sleeping areas for short stays, useful when new crews arrive.
- The Mengtian Laboratory Cabin Module (LCM) is the second experiment module. It has even more space for experiments. It includes a special cargo airlock. This airlock helps move experiments from inside the station to the outside. It can also launch small satellites.
Both laboratory modules provide a sealed environment for scientists to do experiments in microgravity (weightlessness). Experiments can also be placed outside the modules to study the effects of space, like cosmic rays and solar winds. Wentian focuses on life science, while Mengtian focuses on other microgravity experiments.
The modules are moved into place by robotic arms. The Wentian and Mengtian modules use a special "indexing robotic arm" to connect to the main Tianhe module.
Module | Launch time (UTC) | Launch vehicle (Flight No.) | Docking date (UTC) / position | Length | Diameter | Mass | Illustration | Ground image |
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Tianhe | 29 April 2021 03:23:15 | Long March 5B (Y2) | N/A | 16.6 m (54 ft) | 4.2 m (14 ft) | 22,500 kg (49,600 lb) | ![]() |
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Core module with three sections: living quarters, the service section, and a docking hub. | ||||||||
Wentian | 24 July 2022 06:22:32 | Long March 5B (Y3) | 24 July 2022 19:13 (front)
30 September 2022 04:44 (front → starboard) |
17.9 m (59 ft) | 4.2 m (14 ft) | 23,200 kg (51,100 lb) | ![]() |
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First lab module, also serves as backup to core module's station control and management functions. Equipped with an EVA airlock and a 5-metre-long (16 ft) robotic arm. | ||||||||
Mengtian | 31 October 2022 07:37:23 | Long March 5B (Y4) | 31 October 2022 20:27 (front)
3 November 2022 01:32 (front → port) |
17.9 m (59 ft) | 4.2 m (14 ft) | ~23,000 kg (51,000 lb) | ![]() |
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Second lab module with cargo airlock and payload transportation system. |
Station Systems
Communication
Astronauts on Tiangong can talk to Earth in real-time. They use a network of satellites called Tianlian II. These satellites help send live video and audio between the station and ground control in Beijing.
Docking
The Tiangong uses a special docking system to connect spacecraft. This system is similar to one used on the International Space Station. It allows different spacecraft, like the Shenzhou crew capsules and Tianzhou cargo ships, to link up with the station.
Power and Propulsion
The station gets its power from large solar power arrays. These panels turn sunlight into electricity. This energy is stored to power the station when it's in Earth's shadow. The station also has engines to keep it in the correct orbit. These engines use both traditional fuel and special ion thrusters. These ion thrusters are very efficient and can last a long time.
Robotic Arms
The Tiangong station has several robotic arms.
- The longest is the 10-meter (33-foot) Chinarm on the Tianhe core module. It's used for moving things and helping with spacewalks.
- The Wentian module has a smaller, 5-meter (16-foot) arm. It's very precise and helps move experiments outside the station.
- The Chinarm and Wentian arm can connect to work together. This makes them even stronger and able to reach further.
- The Mengtian module has a system to release payloads. It helps move items from inside to outside the station. It can also launch small satellites.
- Two "Indexing robotic arms" help move the laboratory modules into their final positions on the station.
Co-orbit Modules
One exciting future addition is the Xuntian space telescope.
Spacecraft | Launch time and International Designator | Launch vehicle | Operational date | Notes | Length | Diameter | Mass | On-orbit Image (Illustration) |
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Xuntian Space Station Telescope | 2026 (Planned) | Long March 5B (Planned) | 2027 (Planned) | Will share the same orbit and periodically dock with Tiangong | 14 m (46 ft) | 4.5 m (15 ft) | 15,500 kg (34,200 lb) | |
This planned telescope will orbit near Tiangong. It will have a 2-meter (6.5-foot) mirror. It can see a much wider area of the sky than the Hubble Space Telescope. It will dock with Tiangong for maintenance. |
Building the Station
The construction of the Tiangong Space Station officially started in April 2021. The plan involved 11 missions: three module launches, four crewed missions, and four cargo flights.
- On April 29, 2021, the Tianhe core module was launched.
- On May 29, 2021, the Tianzhou 2 cargo ship arrived. It brought supplies for the first crew.
- On June 17, 2021, the Shenzhou 12 crew became the first astronauts to visit Tiangong. They tested the station's systems.
- On July 4, 2021, astronauts Liu Boming and Tang Hongbo did the first spacewalk. They set up equipment outside the station.
- On September 20, 2021, Tianzhou 3 arrived with more supplies.
- On October 15, 2021, the Shenzhou 13 crew arrived. They stayed for six months, a new record for China.
- On November 7, 2021, Wang Yaping became China's first female spacewalker. She and Zhai Zhigang tested new spacesuits and the robotic arm.
- On January 5, 2022, the crew practiced moving the Tianzhou 2 cargo ship with the robotic arm. This helped them prepare for moving future modules.
- On April 16, 2022, the Shenzhou 13 crew returned to Earth.
- On May 9, 2022, Tianzhou 4 arrived with more supplies, including a refrigerator for experiments.

The final building phase began with the Shenzhou 14 mission.
- On June 5, 2022, the Shenzhou 14 crew arrived. They prepared for the arrival of the two lab modules.
- On July 24, 2022, the Wentian lab module was launched and docked with Tianhe. It added an airlock for spacewalks and backup systems.
- On September 2, 2022, Chen Dong and Liu Yang did the first spacewalk from the new Wentian airlock.
- On September 30, 2022, the Wentian module was moved to its permanent side position using a robotic arm.
- On October 31, 2022, the Mengtian module was launched and docked. This completed the main construction of the station.
- On November 3, 2022, Mengtian was moved to its permanent side position. The station now has a "T" shape.
- On November 12, 2022, Tianzhou 5 arrived with supplies and gifts for the first crew handover in space.
- On November 29, 2022, the Shenzhou 15 crew arrived. For five days, six astronauts lived on Tiangong at the same time. This was the first time China had a crew handover in space.
Future Expansion
China plans to expand the Tiangong station even more. It might grow from three to six modules. This would allow more astronauts to live and work there. The Xuntian space telescope module is planned to launch in 2026.
International Cooperation
China built its own space station partly because the U.S. Congress limited NASA's cooperation with China on the International Space Station (ISS). However, China has worked with other countries like France, Sweden, and Russia on space projects.
The European Space Agency (ESA) even trained astronauts with China in 2017. The goal was to send ESA astronauts to Tiangong. However, in 2023, ESA decided not to send its astronauts to the station for now.
Still, Tiangong is open to international experiments. In 2019, the CMSA and the United Nations Office for Outer Space Affairs (UNOOSA) chose nine experiments from around the world. These include projects from Switzerland, Poland, Germany, and Canada. One Canadian experiment is researching if weightlessness can help stop cancer growth.
China has said it welcomes foreign astronauts to visit Tiangong in the future. In October 2022, China even opened its astronaut selection process to people from Hong Kong and Macau.
Life Aboard Tiangong
Daily Life
Astronauts on Tiangong follow Beijing time. They usually wake up around 7:00 AM and have a meeting with Mission Control. They work until 9:00 PM, with breaks for meals and a nap. The station has special lighting that changes to match day and night on Earth. This helps astronauts keep a normal sleep schedule.
The station has smart features. Astronauts use tablet computers to find and organize items. Everything has a QR code! The station also has Wi-Fi, so there are no messy wires.
Food and Hygiene
Astronauts on Tiangong have a wide variety of food, with 120 different dishes. These include popular Chinese meals like shredded pork in garlic sauce and kung pao chicken. They also have fresh fruits and vegetables. The food is prepared to be easy to eat in space. The station has a small kitchen, a refrigerator, a water dispenser, and even the first microwave oven in space! This means astronauts can always have hot food.
The Tianhe module has living quarters for the crew. It has three separate sleeping areas, a space toilet, a shower, and exercise equipment. Each sleeping area has a window, headphones, and good air circulation. There are also three extra sleeping areas in the Wentian module. Astronauts use special equipment to keep their muscles strong in microgravity. The station is designed to be quiet, especially in the sleeping areas.
How Tiangong Works
Since June 5, 2022, Tiangong has always had astronauts living on board. Usually, there are three crew members, but it can hold up to six. The station is controlled from the Beijing Aerospace Flight Control Center. For safety, a Long March 2F/G rocket with a Shenzhou spacecraft is always ready for an emergency rescue mission.
Crewed Missions
The first crewed mission, Shenzhou 12, lasted 90 days. Since Shenzhou 13, missions usually last about 180 days (six months).
China is also developing a new spacecraft called Mengzhou. It will replace the Shenzhou spacecraft. Mengzhou will carry astronauts to Tiangong and could even take them to the Moon. It can carry more astronauts (up to seven) and bring cargo back to Earth.
Cargo Resupply
The Tianzhou (Heavenly Vessel) spacecraft is used to bring supplies to the station. It's a robotic cargo ship that can carry about 6,000 kg (13,200 pounds) of supplies. It launches, travels, and docks with the station all by itself.
List of Missions
- All dates are UTC.
- Forward ports are at the front of the station. Aft is at the rear. Nadir is closest to Earth, zenith is on top. Port is to the left, starboard to the right.
- Key
Uncrewed cargo spacecraft are in light blue colour Crewed spacecraft are in light green colour Modules are in beige colour
Launch date (UTC) |
Docking date (UTC) | Undocking date (UTC) | Result | Spacecraft/Module | Launch vehicle | Launch site | Launch provider | Docking/berthing port | Duration |
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29 April 2021, 03:23:15 |
N/A | N/A | Success | Tianhe | Long March 5B | ![]() |
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N/A | |
29 May 2021, 12:55:29 |
29 May 2021, 21:01 |
27 March 2022, 07:59 |
Tianzhou 2 | Long March 7 | ![]() |
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Tianhe port | 301 days, 10 hours and 58 minutes | |
17 June 2021, 01:22:27 |
17 June 2021, 07:54 |
16 September 2021, 00:56 |
Shenzhou 12 | Long March 2F/G | ![]() |
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Tianhe forward | 90 days, 14 hours and 8 minutes | |
20 September 2021, 07:10:11 |
20 September 2021, 14:08 |
17 July 2022, 02:59 |
Tianzhou 3 | Long March 7 | ![]() |
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Tianhe forward | 299 days, 12 hours and 51 minutes | |
15 October 2021, 16:23:56 |
15 October 2021, 22:56 |
15 April 2022, 16:44 |
Shenzhou 13 | Long March 2F/G | ![]() |
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Tianhe nadir | 181 days, 14 hours and 46 minutes | |
9 May 2022, 17:56:37 |
10 May 2022, 00:54 |
9 November 2022, 06:55 |
Tianzhou 4 | Long March 7 | ![]() |
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Tianhe aft | 183 days, 6 hours and 1 minute | |
5 June 2022, 02:44:10 |
5 June 2022, 09:42 |
4 December 2022, 03:01 |
Shenzhou 14 | Long March 2F/G | ![]() |
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Tianhe nadir | 181 days, 14 hours and 11 minutes | |
24 July 2022, 06:22:32 |
24 July 2022, 19:13 |
N/A | Wentian | Long March 5B | ![]() |
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Tianhe starboard | ||
31 October 2022, 07:37:23.191 |
31 October 2022, 20:27 |
N/A | Mengtian | Long March 5B | ![]() |
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Tianhe port | ||
12 November 2022, 02:03:12:374 |
12 November 2022, 04:10 |
11 September 2023 08:46 |
Tianzhou 5 | Long March 7 | ![]() |
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Tianhe forward | 303 days, 4 hours and 36 minutes | |
29 November 2022, 15:08:17 |
29 November 2022, 21:42 |
3 June 2023, 13:29 |
Shenzhou 15 | Long March 2F/G | ![]() |
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Tianhe forward | 185 days, 13 hours and 56 minutes | |
10 May 2023, 13:22:51:405 |
10 May 2023, 21:16 |
12 January 2024, 08:02 |
Tianzhou 6 | Long March 7 | ![]() |
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Tianhe aft | 246 days, 10 hours and 46 minutes | |
30 May 2023, 01:31:13 |
30 May 2023, 08:29 |
30 October 2023, 12:37 |
Shenzhou 16 | Long March 2F/G | ![]() |
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Tianhe nadir | 153 days, 2 hours and 15 minutes | |
26 October 2023, 03:14:02 |
26 October 2023, 09:46 |
30 April 2024, 00:43 |
Shenzhou 17 | Long March 2F/G | ![]() |
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Tianhe forward | 186 days, 13 hours and 9 minutes | |
17 January 2024, 14:27:30:728 |
17 January 2024, 17:46 |
TBD | Tianzhou 7 | Long March 7 | ![]() |
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Tianhe aft | ||
25 April 2024, 12:59:00.479 |
25 April 2024, 19:32 |
TBD | Shenzhou 18 | Long March 2F/G | ![]() |
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Tianhe nadir | ||
25 October 2024 | 25 October 2024 | TBD | Planned | Shenzhou 19 | Long March 2F/G | ![]() |
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Tianhe forward | |
November 2024 | November 2024 | TBD | Tianzhou 8 | Long March 7 | ![]() |
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Tianhe aft | ||
2026 | N/A | N/A | Xuntian | Long March 5B | ![]() |
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N/A |
End of Mission
Tiangong is designed to work for at least 10 years, possibly up to 15 years. When its mission ends, the station will be guided to fall safely back to Earth. It will burn up in the atmosphere, and any small pieces that remain will land in uninhabited areas of the ocean.
How to See Tiangong from Earth

Just like the International Space Station, you can sometimes see the Tiangong space station from Earth with your own eyes! It looks like a very bright star moving across the sky. This is because sunlight reflects off its shiny modules and solar panels.
See also
In Spanish: Estación espacial Tiangong para niños