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This article is about the physical concept of gravitation. For information on the manga/anime series, see Gravitation (manga)

Gravitation is the tendency of massive objects to accelerate towards each other.

There have been numerous theories of gravitation starting with the work of Aristotle in ancient Greece. After the Renaissance, gravitational theory was dominated by Newton's theory, in which gravitation is ascribed to the force of gravity. During the 20th Century, the theory of gravity was replaced by Einstein's general relativity theory, which ascribes gravitation to the effects of spacetime curvature.

It is important to note that gravitation is not gravity. Gravity is a force that was postulated to be responsible for gravitation. So the term gravitation describes an effect independent of any cause. It is possible for gravitation to exist without gravity, and in general relativity theory, that is indeed the case.