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...astronomy, began with the application of Newton's theory of mechanics and gravitation (as elucidated in the ''Principia'') to the movement of planets. Eventually

[[Isaac Newton]]'s discovery of universal gravitation explained the behavior both of objects here on earth and of objects in the

...' is a [[planetary system]] containing a central star, the [[Sun]], with [[Gravitation|gravitationally]] bound, orbiting members including the [[Earth]], seven ot