There is an attractive force acting between two masses. This force is directly proportional to them, and inversely proportional to the square of the distance that separates them. And 'the very well known force of gravity. What keeps us glued to the ground, which holds the planets in orbit around the sun and the sun around the center of the galaxy and the galaxy around the center of gravity of the system of galaxies to which it belongs. We know that the force acting between us and a pen between two grains of sand between any agglomeration of matter. It 'a force that has very low intensity. In fact we perceive it only when we are dealing with very high masses, just as the planets or stars. Classical physics mechanics arises in one of its bases. E mechanics is the most important force in gravity. Yet this force does not exist.
In 1916 Albert Einstein gave a new vision of space and with it a new interpretation of the phenomenon for more than two hundred years we have seen as attractive force.
A mass curves space around it just like a ball of lead placed on a trampoline. There is no force that attracts two masses together. They simply follow the curvature of space by inertia. If space is "straight," Euclidean to be clear, the motion of inertia of a mass is straight and uniform, so to explain orbital motion is necessary to consider the existence of a force acting on the mass. So in this vision the moon orbits the Earth (actually around the center of gravity of the Earth-Moon system) because it suffers from the Earth's gravitational force. But in reality the moon is not affected by the action of any force. It simply follows its own inertia, or the lines of curvature of space due to the presence of our planet.
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