Аbstract: The study presents a model of the shielding of gravitational fields by

cosmic protons. Gravity shielding is based on a principle. An elementary

particle with a rest mass.  In free fall. Shields all the gravitational fields in which

it is located. In this paper, the intensity of the gravitational field from an infinite

cosmic half-space is determined. The cross section of the proton shielding the

gravitational field is determined. The radius of action of gravitational forces in

space is calculated.  The formula for calculating the distance to the galaxy from

its "red" shift is obtained. The lifetime of a photon in space is calculated.  The

size of the visibility horizon of the Universe is determined.