This force binds electrons to nuclei to form atoms. It also binds atoms to form matter. A fundamental unit of the cosmic macrostructure. Galaxies are classified based on their shape. Force responsible for attraction between all matter.
Gravity is the weakest of the fundamental forces but it acts over great distances.
Einstein's general theory of relativity treats gravity not as a force but as a curvature of space and time. A model of a solar system, first proposed by Copernicus , in which the Sun is placed in its center and all planets are revolving around it. Element with a nucleus of two protons and two neutrons. Helium is a component of most stars, including the Sun, where the nuclear fusion process converts hydrogen into helium with the production of heat and light. The radius vector of each planet sweeps out equal areas in equal times.