Japan launches the world's first wooden satellite into orbit in hopes of solving Earth's space junk problem
A wooden satellite sounds like something from a children’s book. But Japan has already sent one into orbit for a very serious reason.
Space is getting crowded, more satellites are being launched, and today’s materials may leave problems long after a mission ends.
The wooden satellite, called LignoSat, was developed by experts at Kyoto University and partners in Japan’s space community.
The design of LignoSat
The satellite is a small cube that’s roughly 10 centimeters on each side. Despite its size, Lignosat raises a big question: could wood become a practical material for future spacecraft?
To test how wood behaves in orbit, LignoSat was deployed from the International Space Station (ISS) in December 2024.
The final design used honoki magnolia panels joined with a traditional Japanese woodworking technique rather than glue or nails.
Why wood was chosen
The design choice had a practical reason. Today, most satellites rely on aluminum alloys and other metals.
When satellites complete their missions, operators often guide them back into Earth’s atmosphere. They burn up during reentry, and the metal does not simply disappear.
Conventional satellites can leave behind tiny alumina particles that may remain in the atmosphere for decades.
Human activity beyond Earth
Astronaut Takao Doi warns that the issue could grow as the number of satellite launches increases in the years ahead.
Doi knows space from direct experience. He flew aboard the Space Shuttle Columbia in 1997 and became the first Japanese astronaut to conduct an extravehicular activity. He flew again in 2008.
Now, as a researcher at Kyoto University and a visiting professor at Ryukoku University, Doi is studying how human activity beyond Earth can become cleaner and more sustainable.
Inspiration from the city of Kyoto
Doi’s inspiration came partly from Kyoto itself. The city is home to wooden temples and shrines that have survived for centuries despite rain, humidity, insects, and dramatic seasonal changes.
Doi looked at those structures and saw more than cultural heritage – he saw engineering.
If wood could last so long on Earth, he wondered what it might do in space, where there is no rain, no insects, and and none of the usual forms of rot.
Testing wood samples in space
The team did not choose just any wood. After testing several options, researchers selected honoki, a Japanese magnolia valued for stability and workability.
Craftspeople have traditionally used it for Japanese sword scabbards because it is light, smooth, and resistant to warping.
In earlier ISS exposure tests, wood samples spent more than 240 days in the harsh space environment.
Researchers found no major cracking, warping, peeling, surface damage, or mass change.
Temperature and joint stress
Even so, space is hard on materials in ways Earth is not.
A satellite circles the planet roughly every 90 minutes, moving from direct sunlight into Earth’s shadow and back again.
That cycle can expose materials to extreme temperature swings. Metal fasteners can also create stress because metal and wood expand and contract differently.
A screw that works perfectly in a chair or cabinet could become a weak point in orbit.
Japanese joinery in space
The LignoSat team turned to traditional Japanese joinery. The satellite’s wooden shell uses an interlocking joint called tomegata kakushi arikumi-tsugi – often described in English as a blind miter dovetail joint.
The technique lets wood pieces hold together without nails or adhesives.
For LignoSat, skilled artisans shaped four-millimeter-thick wooden panels with tolerances as fine as 0.1 millimeter.
That precision helped an old craft meet spaceflight standards.
Satellites that rely on less metal
LignoSat still includes some metal parts because it had to meet safety and deployment requirements for the International Space Station.
The long-term goal is to build satellites that rely far less on metal, reduce harmful residue during reentry, and test whether natural materials can serve modern space missions.
The initial plan was to use onboard sensors to measure strain, temperature, radiation effects, and possible interference from Earth’s geomagnetic field.
Results of the first mission
The first mission did not go perfectly. After LignoSat reached orbit, the team had trouble establishing reliable communication with the ground.
Doi said the main goal was to learn whether a wooden satellite could function in the vacuum of space.
On that point, the project succeeded. The satellite completed a four-month mission.
The team continued investigating possible causes of the communication problem, including software issues and antenna deployment failures.
Future of the LignoSat mission
The next versions will build on those lessons. The team is preparing LignoSat-1R for a planned launch during Japan’s fiscal year 2027, with improved ground communication as a major target.
A later version, LignoSat-2, is expected to use a flat communication antenna stored inside the spacecraft.
Researchers are also considering practical uses, including a satellite network that could help maintain communication after major disasters damage ground-based towers.
Shielding electronics from radiation
A recent study published in the journal Advances in Space Research supports the idea of using wooden satellites.
The team tested 10 wood species under proton beam irradiation to evaluate how well wood could shield spacecraft electronics from space radiation.
The authors found that some wood samples performed surprisingly well.
In the study’s tests, five-millimeter panels of Quercus and Betula schmidtii matched the shielding performance of two millimeters of aluminum.
The researchers concluded that the results support the use of lightweight wooden CubeSat structures that could reduce debris in low Earth orbit missions
A careful path forward
The results do not mean that future satellites will suddenly look like cabins in orbit.
Engineers still need to solve hard problems involving durability, radiation, thermal cycling, communication, manufacturing, and mission safety.
But LignoSat shows that wood is worth testing as a spacecraft material. It also shows how old knowledge can work with new technology in useful ways.
Implications for space engineering
Japan’s wooden satellite brings together two ideas that rarely sit side by side: ancient craftsmanship and space engineering.
The first concept comes from carpenters who learned how to make wood last for generations.
The second idea comes from researchers trying to build cleaner tools for life beyond Earth.
LignoSat connects those ideas. It is a small wooden box in orbit that raises a simple science question: can one of humanity’s oldest materials help make future space missions cleaner?
