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I find it dubious. Typically the gravity is the sum of all the gravitational pulls. So, with the moon between the earth and the sun, then earth is pulled by both the sun and the moon. And, of course, any effective gravitational shielding must be carried with the vessel.Hmmm...Perhaps one would find an exotic particle that is repelled by gravity, somewhat like diamagnetic elements are repelled by magnets. Then, why not build the ship out of them unless they were "toxic" to humans. Of course, a particle that is repelled by gravity would be rarer than helium-3 on earth.Some people speculated that antimatter might have a negative gravitational interaction, but all indications are that it behaves in gravity exactly like regular matter.