White dwarf

A white dwarf is a type of star that loses much of its' mass, causing it to shrink, but its' density remains the same, allowing it to still retain its' strong gravitational pull.

The Raven used a small fragment of a white dwarf for his spacecraft that he invented, allowing him to use the gravity field of the white dwarf to steal certain objects, such as the Washington Monument. He used a gravity shield to protect himself from the powerful gravitational force, and allow him to have full control of its' gravity.