Hey I am new to this also... Very good and interesting question... I would imagine that being that we live within the vortex of gravity that is created by the mass of our planet,Which is bending the repelling force of space itself. You may need to look at what might repel those very forces... not the planets? If you are going to use whatever you are levitating to traverse outside of this atmosphere.. For something just inside of this atmosphere; The magnetism seems like it should work but for some reason doesn't... Magnetism is stronger than gravity... the earth is like a giant magnet... It would have to be a really strong magnetic force to thwart gravity.(for some reason) A small group in Norway used an incredibly powerful magnet to float a frog. Not only a frog, but water, a strawberry and a grasshopper...