In a groundbreaking development in space exploration, NASA, in collaboration with the Japan Aerospace Exploration Agency (JAXA), is set to launch the world’s first wooden satellite, LignoSat, in 2024. This initiative marks a significant milestone in the quest for sustainable spaceflight alternatives amidst the growing concern of space debris.
The Problem of Space Debris
Currently, our Earth’s orbit is cluttered with over 11,000 tons of space objects, including non-functional satellites and rocket fragments. These space debris not only increase light pollution but also hinder the observation of distant space phenomena. As of now, approximately 10,590 satellites orbit Earth, with about 8,800 still operational, as reported by the German news agency DW. The accumulation of these objects poses a serious threat to future space missions and Earth’s orbit’s cleanliness.
Why Wood?
In the quest for a biodegradable material that could mitigate these issues, scientists turned to wood. Specifically, magnolia wood has shown promise for space use. Unlike other materials, wood does not burn or decompose in the vacuum of space. Instead, it incinerates upon re-entering Earth’s atmosphere, turning into fine ash. This property makes wood an effective biodegradable alternative for future satellites.
The Making of LignoSat
The LignoSat, roughly the size of a coffee cup and made of magnolia wood, was developed by American and Japanese scientists under the coordination of Kyoto University. The meticulous process of selecting the wood type involved space exposure tests of different woods, including magnolia, cherry, and birch, for over 290 days on the International Space Station’s (ISS) Japanese experimental module, Kibo.
These tests revealed that magnolia wood is the most resilient, showing no signs of processing, warping, or surface damage after ten months of exposure. It also proved more durable during processing.
Koji Murata, a researcher at Kyoto University, explained to CNN that wood does not face combustion, rotting, or warping issues in space as there is no oxygen to fuel fire and no living organisms to cause decay.
The Future of Wooden Satellites
This innovative approach is aimed at reducing the increasing amount of metallic objects and space debris that contribute to Earth’s atmospheric light pollution and pose threats to the ISS and other spacecraft. Biodegradable satellites like LignoSat offer a promising alternative, being potentially less harmful and cheaper to produce.
As the 2024 launch approaches, researchers are investigating the degradation mechanisms of materials at the nanoscale. Their findings could lead to stronger wooden materials for new space applications, opening up a new frontier in sustainable space exploration.
