Empty Universe. Gravity. Author: Yanbikov Vildan Shavkyatovich. Volgograd. firstname.lastname@example.orgAbstract : Calculated the speed of propagation of gravity in space. ( the speedof gravity waves). The computed gravitational constant for the “empty” space. Keywords : Speed of gravity waves, gravitational constant, the physicalvacuum, the flux density of gravitational energy. Let the substance of the universe is distributed evenly throughoutouter space. In one cubic meter of space contains n protons. All space is filledwith gravitational energy. In the form of wave fronts propagating with a certainabsolute speed. Throughout endless outer space. These wave fronts carry thegravitational energy. Environment for the propagation of the gravitationalwave fronts is the physical vacuum. Consisting of virtual photons. Virtualprotons tightly Packed inside the physical vacuum with the density of nuclearmatter or neutron stars. Virtual protons of the physical vacuum re-emitgravitational energy in spherical wave fronts. The protons real substance. Thesame way as the protons. re-emit gravitational energy in spherical wave fronts.Real protons contribute to the unevenness in the distribution of gravitationalenergy in space. Which leads to violent interactions between the clumps of realsubstance. Determine the speed of propagation of the wave front. Outer spacewith the participation of the physical vacuum. Virtual protons obey the laws ofphysics for real substance. Consider the passage of a wave front through avirtual proton of the physical vacuum. When “contact” of the wave front withthe “surface“ of the virtual proton, the signal of interaction propagates to thecenter of the proton.