Gravitation
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Gravitation is a phenomenon which attracts all objects within the universe to each other [1]. In modern physics it is explained by Albert Einstein's general theory of relativity. Before general relativity, gravitation was described by Issac Newton's law of universal gravitation, which is still useful in most situations.
Gravitation is responsible for the formation of the earth and sun, the stars and the planets.
References
- ↑ New Oxford American Dictionary, 2nd Edition