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The recent astronomical observations indicate that the expanding universehaving a finite particle horizon is homogeneous, isotropic and asymptoticallyflat. The Euclidean geometry of the universe enables to determine the totalkinetic and gravitational energies of the universe within the framework of theNewtonian mechanics. It has been shown that almost the entire kinetic energy ofthe universe ensues from the cosmological expansion. Both, the total kineticand gravitational energies of the universe have been determined in relation toan observer at arbitrary location. It is amazing that the modulus of the totalgravitational energy differs from the total kinetic energy with a multiplierclose to a unit. Thus, the total mechanical energy of the universe has beenfound close to zero. Both, the total kinetic energy and the modulus of totalgravitational energy of the universe are estimated to 3/10 of its total restenergy M*c^2.

Determination of total mechanical energy of the universe within the framework of Newtonian mechanics.