Not at all surprised this is coming out of Japan; they’ve been demonstrating for centuries that wood can be used in lieu of metal, often with superior results.
Wood seems like a good choice for a satellite - it’s lightweight, easy to machine into different shapes, it’s cheap and readily available. It also doesn’t conduct heat as well as aluminum or steel, but I don’t know enough about building satellites to know if that’s a problem.
Because it is less ductile and flexible than aluminum or titanium. It’s easier to decommission by burning it up in the atmosphere without leaving particles behind, and if it collides with another object, it’s more likely to be obliterated.
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