Frame-dragging
However, the way to imagine this "gravity" is not so much as the force that we normally consider when we think of gravity, since normal gravity is created as well (due to its mass). Basically, frame dragging is an effect that occurs when one object is moving near another, which makes both objects change their motion because of the other's motion. Frame dragging does not occur if an object is neither spinning nor moving. In effect, one object "deflects" the motion of the other, and the other way around.