Gravity is the force that attracts and binds all matter in the universe, no matter where that matter is situated. You yourself have a gravity field which pulls on everything around you. read more
This is because although Pluto satisfies the requirements of being large enough to be pulled into a sphere by the force of its own gravity, while simultaneously orbiting a star, it fails on the last planetary requirement: it has not cleared the neighbourhood around its orbit - it is not big enough to dominate the other celestial bodies in its path. read more