> For long mission durations, storable hypergolics are the way to go for now. Soyuz is a counterexample which flies for decades. Lockheed's engineers working o

> For long mission durations, storable hypergolics are the way to go for now. Soyuz is a counterexample which flies for decades. Lockheed's engineers working on orbital fuel storage (Advanced Cryogenic Evolved Stage) will also point that it's not a law of physics.