Gravitation is a natural
phenomenon by which all objects with
mass attract each other. In everyday life, gravitation is most familiar as the agency that endows objects with
weight. It is responsible for keeping the Earth and the other planets in their
orbits around the Sun; for keeping the
Moon in its orbit around the Earth, for the formation of
tides; for
convection (by which hot fluids rise); for heating the interiors of forming stars and planets to very high temperatures; and for various other phenomena that we observe. Gravitation is also the reason for the very existence of the
Earth, the
Sun, and most macroscopic objects in the
universe; without it, matter would not have coalesced into these large masses and life, as we know it, would not exist.
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