Spaceship fuel on Europa
What would make a good propulsion source for small engines and manouvering thrusters for spacecraft vehicles on Europa (moon of Jupiter), both for near-surface operations (vacuum) and in caves beneath the ice (low or medium pressure)?
I am only interested in spacescraft thruster propulsion systems, not wheels or tanks tracks etc. My version of europa has an extensive cave system within the ice, which will be navigated by spacecraft using thrusters. I am ignoring gas pressure and propellors, and assuming the pressure is too low to bother with aerodynamics.
Say my colonists have ample amounts of electricity from fusion power. They want to use local materials if possible. Refueling drops from other locations in the jovian system are acceptable as long as they are plausible and make economic sense...
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