you really need an explanation? ok then its called grav-lev, same stuff was used in the 31st century when mechs first hit inter-galactic battle fields. this tech allows objects of immense size to "float" in the air as if by magic. Due to the size of the object a large amount of power is required right? Yes, but you can harness the power of static friction from the metal plates that are the surface of the said object and power the grav-lev device indefinitely.