An interesting exercise in rocket science: consider a craft that shuttles between the Moon and Earth transporting Helium-3. Mass of the craft, energy efficiency of rocket fuel (you cannot recover the energy spent in escaping the Earth's and Moon's gravity), mass of Helium being transported. Under what conditions is it energy efficient (energy from fusion exceeds transport energy)? Under what conditions is it cost efficient?
Inspired by the 2009 film Moon.
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