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Originally Posted by Happy Monkey
The type of fuel is important. Cassini has gone pretty far on not very many liters of plutonium. Not that plutonium is usually measured in liters, but still. Also, Cassini doesn't have to deal with much friction...
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Huh? You might as well have said titanium or silicon as plutonium, since none of them have anything to do with the propulsion of the vehicle.