Quote:
Originally Posted by eburacum45
That's right.
And even if we have a hydrogen economy at some time in the future, there will be no advantage in mining hydrogen from Jupiter or even Uranus and sending it to Earth; the energy consumed in extracting it from a gas giant's gravity field and sending it across the solar system would be more than the energy obtained from the hydrogen itself, so it would be better not to bother.
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Supppose it is only Jupiter's gravity that is the issue?
I'm thinking of a one-time expenditure of energy to put a big hollow rock in an orbit that regularly passes close to Earth and to Jupiter (some micro-corrections needed from time to time, perhaps). This expenditure is amortized over the lifetime of the rock (hopefully centuries or more)--and the per-load cost is that of getting the hydrogen from jupiter to the rock, and from the rock back to Earth.
Todd