Gravitational Force

The gravitational force is the mutual force of attraction between any two objects, purely by virtue of their masses. It is completely universal: every object in the universe experiences it due to every other object. It is what pins us and everything around us to the Earth, and at the same time it is what keeps the Moon and artificial satellites in orbit around the Earth, and the Earth and the other planets in orbit around the Sun. On the largest scales it drives the formation and evolution of stars, galaxies and galactic clusters — despite bei …