Based on the Planck units, we can describe the entire universe as a black hole expanding and rotating with speed of light. In this model, there is no need for dark energy or inflation, and the nature of dark matter is solved as well. We can deduce the Planck-temperature and the average temperature of the universe from the energy density of thermal radiation, and we can determine the Hubble constant from the age of the universe, as well as those basic parameters of the universe which coincide with current measurements. According to the Planck power, all masses of the universe radiate gravitational energy, which will then propagate through space with speed of light. It can be proven that the interaction of gravitational waves with matter is the reason for the attractive force (exerted by) of gravity, that is the boson that mediates gravitational interactions is the graviton. Since the mass of a body also determines the power and frequency of the gravitational wave, the reverse is also true, and the power and frequency of an electromagnetic wave can determine the mass of a given body as well, because of the similarity of gravitational and electromagnetic waves.