The basic forces that govern the universe are repulsive force, gravity, quark interaction, and electromagnetic force. All forces except repulsive force are attractive forces.Among these forces, repulsive force or expansive force is a force that acts between pure energies, which is the force that dominates the universe. As the universe expands, the temperature decreases and changes into dark energy and dark matter when it reaches 〖10〗^13 K.Dark matter is an invisible material called imp (invisible material particle) and consists of imps and quarks. Imp liberates gravity and creates a gravitational field. As the universe continues to expand and the temperature decreases, at 〖10〗^10 K, an imp interacts with quarks to create neutron, and the force acting at this time is quark interaction. Quark interaction is involved in creating all particles such as neutrons and protons, and is also involved in creating and closing electromagnetic force fields.Electromagnetic force is a force made by creating an electromagnetic force field inside the proton and emitting electrons during the process of converting neutron into proton. It is also involved in closing the electromagnetic force field during the process of converting proton into neutron.