Barger, Vernon D. Department of Physics, University of Wisconsin, Madison, Wisconsin.
Last reviewed:January 2019
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- Newton's law of gravitation
- Relativistic theory
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The mutual attraction of all entities with mass or energy in the universe. Gravity, also referred to as gravitation, is one of the four fundamental interactions in nature. We experience gravity in everyday life as the force that holds our feet to the ground and brings a thrown ball back toward the Earth (Fig. 1). More broadly, gravity holds our planet in orbit around the Sun, and our Sun in orbit around the center of the Milky Way Galaxy. At grander scales, gravity holds galaxy clusters together and is the force responsible for building up structure across the expanse of the cosmos. See also: Cosmology; Earth; Earth's gravity field; Fundamental interactions; Galaxy; Milky Way Galaxy; Planet; Solar system; Sun; Universe
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