> Their big problem is that they depend for fuel on 3He, and there isn't any. Not on Earth, and not even, usefully, in the lunar regolith. It's interesting tha

> Their big problem is that they depend for fuel on 3He, and there isn't any. Not on Earth, and not even, usefully, in the lunar regolith. It's interesting that talking with rocket people, they point out that getting enough - enough - He3 from the Moon regolith isn't that big of a problem, and then the phrase is practically repeated - "their big problem is that 3He isn't needed by anybody on Earth, since there are no fusion plants to utilize it". Classical catch-22.