Dark energy has been introduced in order to explain the observed acceleration of the expansion of our Universe. It seems to be distributed almost uniformly and it has an essential influence on the present value of the Hubble constant which characterizes the rate of this expansion. The Newtonian theory of gravitation is formulated so that the laws of conservation of energy and momentum hold. However, the Universe is designed so that the total amount of energy is slowly, but continually increasing, since its expansion is accelerating. Our examples show that even the Solar System and also our Galaxy imperceptibly expand thanks to dark energy whose origin s are tiny antigravity forces . We claim that these forces appear due to the finite speed of gravitational interaction, which causes gravitational aberration effects. We show that effects of dark energy are observable ; they are not only globally, but also in local systems. These effects can be measured and are comparable with the present value of the Hubble constant.
KeywordsHubble ParameterDark EnergyAntigravityCosmological ConstantGravitational AberrationConservation of Energy and Momentum LawSolar System
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