A wooden satellite designed by researchers at Kyoto University was launched into space for a six-month experiment on whether timber can function as a spacecraft material. Named LignoSat, the craft is made from honoki, a magnolia species traditionally used in Japan for sword sheaths. Its developers described it as the world's first wooden satellite.
The team assembled the satellite with a traditional Japanese woodworking method, avoiding both screws and glue. That construction followed a 10-month experiment aboard the International Space Station in which the researchers compared timber for use beyond Earth. They concluded that honoki was the most suitable wood for the planned mission.
During its expected six months in Earth orbit, LignoSat is intended to record how the material responds to a severe thermal cycle. Temperatures can move between minus 100 and 100 degrees Celsius (minus 148 and 212 degrees Fahrenheit) every 45 minutes as an orbiting object alternates between darkness and sunlight. The experiment will also examine whether timber can lessen the effects of space radiation on semiconductor components.
Researchers identified several potential advantages over conventional spacecraft materials. Wood in space is not exposed to moisture that would cause decay or oxygen that would allow it to burn. At the end of a satellite's service, the material is also expected to burn during atmospheric re-entry with less pollution. Conventional satellites can produce oxide particles when they re-enter and are destroyed. The mission is designed to test those expectations in operating conditions rather than assume that performance on Earth will transfer directly to orbit.
Takao Doi, an astronaut who studies human activity in space at Kyoto University, linked the experiment to the team's much longer-term interest in using renewable material away from Earth. The researchers have set a goal of planting trees on the Moon and Mars within 50 years, envisioning locally producible timber as a possible construction resource. Doi also said that, if LignoSat works, the team wants to present the concept to SpaceX.
Kenji Kariya, a manager at the Sumitomo Forestry Tsukuba Research Institute, argued that wood could become relevant as human activity expands toward the Moon and Mars. For now, LignoSat is a limited materials demonstration. Its measurements of temperature exposure, radiation shielding and structural endurance will determine whether the unusual construction offers practical value for future satellites.
The six-month test was expected to compare those claims with actual performance over repeated orbital cycles. Researchers would need the measurements to judge whether honoki's structural behaviour and possible radiation effects support a wider spacecraft application after the demonstration ends.
