Gravity Field

A gravity field or gravity shield is a type of force field used protect one from the effects of gravity. The Raven used a gravity field so as to protect him from the vast gravitational pull of a white dwarf.

Even though the white dwarf was small enough to carry in one's own hands, it would have been impossible for anyone to transport the white dwarf without the force field, as one would have been sucked into the white dwarf, due to it's density and incredible gravity.