This paper presents a new formula for the gravitational force – formula (1). It is based on the following reaction of an Electron Antineutrino with a Proton: ̃ve + p+ → n + e+ and is only the principal component of the possible gravitational forces that may exist in the Universe. I assume that all interactions that are weak and do not belong to these four types of known interactions and decrease with the square of the distance, can also be considered as gravitational interactions. Gravity is a product of the so-called weak interactions, if one interprets this reaction and the formula for the gravitational force associated with it correctly. The new formula uses the numerical values measured by Cowan and Reines in an experiment conducted by these two physicists with electron antineutrinos to determine the probability of this above reaction occurring. In the new formula, there is a constant value for the energy density of relic electron antineutrinos which, however, only to a limited extent guarantees the stability of the gravitational forces, since there are neutrino sources in the Universe and even in our immediate surroundings, such as the Sun or even nuclear reactors. The gravitational field is not a fictitious property of space, but is directly related to the transfer of momentum and energy of neutrinos to particles of matter. I assume that the mathematical formulas used in this work are understandable to anyone with some interest in mathematics and physics.