I never said I could explain it. Only that "there are not any commonly accepted theories that prohibit it from functioning (well none that I'm aware of anyway)."
Currently, it is generally accepted that gravity is mediated by a particle called a graviton. I admit, there is no solid proof of its existence, but then science has relatively few proofs when compared to theories. If we assume the graviton does exist, then it is not that much of a stretch to think that with 2000 years more science, that someone might figure out how to control it without needing all that mass.
If you have proof that the graviton does not exist, then please share this information with the rest of the scientific community so they can spend their time on other theories.
If you do not believe that science will ever explain anything not already known, or pose new questions never thought of, then you will always nit-pick science fiction, and never gain anything from it.
Just as a note: Newtonian gravity works OK on large scale, but breaks down at smaller scales. It does work for your example, however, because with newtonian gravity that is considered large scale. Small scale is considered less than the width of an atom. But then, I'm just being nit-picky.
Re: Semi-OT: A question on Power Ratios in Sci-fi
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