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Buckle up steampunk enthusiasts, it turns out that not only are steam-powered space probes possible, they might be perfect for hopping between comets and asteroids on research and mining missions.
If we're going to have astronauts working and living in space for years at a time, cramming them in tight, fixed spaces without artificial gravity is doing them, and us, a major disservice.
Single stage to orbit spacecraft have been mothballed for decades. But with the potential of space tourism, there may be an incentive to take another run at designing them.