That is the only option which makes sense. LOX isn't good for things which wait. Solids have low efficiency. Hypergolics are a good choice for something that ha

That is the only option which makes sense. LOX isn't good for things which wait. Solids have low efficiency. Hypergolics are a good choice for something that has to sit idle for a very long time, and the chemistry has been understood for decades. I guess I was hoping the Russians had figured out ion thrusters in the 70s or something.