I am sure this question includes multiple mistakes, so please bear with me. Gravity is force that is capable of doing work (moving objects over a distance). So under some circumstances, force of gravity is a form of energy or potential energy. How much gravitational energy/potential energy exists in the known universe? Is the total gravitational energy/potential energy simply a function of the total mass of the universe, or does it depend on the distances between objects? How does gravitational energy/potential energy compare to the quantity of other forms of energy (EM radiation, heat, any others?) in the known universe? Thanks in advance. Any links or pointers to books/articles would be appreciated.