Here’s an interesting side-by-side comparison of the interiors of China’s Tiangong space station vs the International Space Station (ISS). Tiangong looks way futuristic, that’ what actually future space stations look like in science-fiction movies. The good, old ISS clearly shows its age.

The interiors of Tiangong vs ISS
The interiors of China’s Tiangong space station vs the International Space Station (ISS)

Tiangong space station

Currently, under construction as of February 2022, the Tiangong space station is in low Earth orbit between 340 and 450 km (210 and 280 mi) above the surface. It is China’s first long-term space station. Once completed, it will have a mass between 80 and 100 tonnes (180,000 and 220,000 lb), roughly one-fifth the mass of the International Space Station and about the size of the decommissioned Russian Mir space station.

The Chinese government is planning to complete the Tiangong space station by the end of 2022.

Its interior will look way more futuristic than the ISS’, but that’s not the only difference. Other major differences include:

  • Tiangong (which means “Heavenly Palace”) will be much smaller than the International Space Station (ISS). It will have only three modules compared with 16 modules on the ISS. The three modules of Tiangong are:
    1. Tianhe core module
    2. Wentian Laboratory Cabin Module
    3. Mengtian Laboratory Cabin Module
  • The Chinese space station will also be lighter than the ISS – it will be about between 80 and 100 tonnes in weight. The ISS weighs about 400 tons (450 metric tons) following the recent addition of Russia’s Nauka module.
  • Tiangong is fitted with the Chinese Docking Mechanism, based on the Russian Androgynous Peripheral Attach System (APAS-89/APAS-95) system. The ISS has also APAS-95 docking ports, so both space stations’ docking systems should be compatible in theory. But, despite NASA describing the Chinese Docking Mechanism as a “clone” to APAS, rumors say that the two docking systems will not be fully compatible.
  • The regular size of ISS crew is 6, but it has supported as many as 13 crew members onboard. The Chinese counterpart is currently equipped to handle three “taikonauts” (taikonaut is the combination of space Chinese – taiko, and sailor in greece – naut).
  • It seems the Tiangong will be quieter. The noise level in the working area is 58 decibels (dBA), while in the sleeping area, the noise is kept at 49 decibels. A moderate rainfall is 50 dBA, for example, and a normal conversation is 60 dBA. Acoustic levels at most locations on the International Space Station are close to 60 dBA, too, however, certain areas of the space station are particularly noisy and are a potential source of hearing loss for astronauts. Canadian astronaut and former commander of the ISS, Chris Hadfield made a recording in 2013 so you can get an idea of what the ISS sounds like by listening to it (see the video below).
International Space Station (ISS) Ambient Noise for 12 Hours. Based on a 2013 recording by Chris Hadfield.

A third-generation space station

Tiangong will be a third-generation modular space station, like MIR or the ISS.

  1. First-generation space stations, such as early Salyut, Almaz (Russia), and Skylab (United States), were single piece stations and not designed for resupply.
  2. Second generation, Russia’s Salyut 6 and 7, and China’s Tiangong 1 and 2 space stations, are designed for mid-mission resupply.
  3. Third generation stations, such as Mir and the International Space Station, are modular space stations, assembled on-orbit from pieces launched separately.
Tiangong space station completed linterior
This simulation shows the interior of the completed Tiangong space station. You can take the virtual tour here.

Life aboard the Tiangong space station

The core module of the space station, Tianhe provides living quarters for the crew members, containing three separate sleeping berths, a toilet, shower facility, and gym equipment. At least one berth features a small window, a headphone, ventilation, and other amenities. Other properties and facilities include:

  • The planned pressurized (habitable) volume will be 110 m3 (3,880 cu ft).
  • Neuromuscular electrical stimulators to prevent muscle atrophy.
  • The noise level in the working area is 58 decibels, while in the sleeping area, the noise is kept at 49 decibels, as explained above.
  • The Tiangong space station has a Wi-Fi network for wireless connection. Each astronaut wears a bone-conduction headphone and microphone for easy communication.
  • 120 different types of food, selected based on astronauts’ preference, are stored aboard the Tiangong. Food storages are resupplied by trips of the Tianzhou-class cargo ship. Fresh fruits and vegetables are stored in coolers. Huang Weifen, chief astronaut trainer of CNSA, explains that most food is prepared to be solid, boneless, small-piece. Condiments such as pork sauce and Sichuan pepper sauce are used to compensate for the changes in the sense of taste in microgravity.
  • The station is equipped with a small kitchen for food preparation and the first-ever microwave oven in spaceflight so that astronauts can “always have hot food whenever they need.”
  • Taking a bath in microgravity is next to impossible, so the crew use a spray gun before wiping themselves clean.
  • There’s a space gym in the core module equipped with various workout equipment.
  • All the taikonots have a handheld terminal connected to an app to switch cabin lightning between work, sleep, and exercise modes.
  • A private voice channel has been reserved for the crew to call their families and friends on Earth from space.
  • Like the ISS, various robotic arms will be used aboard Tiangong too. An ISS Canadian-style SSRMS robotic arm was folded under the Tianhe core module. Additionally, the Wentian experiment will carry a duplicate stowed second SSRMS robotic arm. A Russian Lyappa arm for dockings and relocations, and also a 10-meters long robotic arm for exterior station operations (spacewalks) mounted on the Tianhe module.


M. Özgür Nevres

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