PART 4: Newtonian description of the Universe's expansion


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The Friedmannien equation can be represented in newtonian form. Moreover the evolution of our Universe can be described in newtonian form. This approach reveal the physical sense of the cosmological equations and help to understand them. The main difference between the exact (Friedmannien) equations and newtonian form is that one can
account that the source of gravitational field is both the density of matter and pressure of matter. It changes the numerical value of gravitational field and in the case of negative pressure it can change the attraction into repulsion. The newtonian description of the Universe's expansion is presented as comparison with the motion of a rocket which leaves the Earth.