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In order of increasing distance from the Sun, they are the four terrestrials, Mercury, Venus, Earth, and Mars, then the four giant planets, Jupiter, Saturn, Uranus, and Neptune.Six of the planets are orbited by one or more natural satellites.The concept has expanded to include worlds not only in the Solar System, but in hundreds of other extrasolar systems.

Several planets in the Solar System can be seen with the naked eye.In 2006, the International Astronomical Union (IAU) officially adopted a resolution defining planets within the Solar System.This definition is controversial because it excludes many objects of planetary mass based on where or what they orbit.These were regarded by many early cultures as divine, or as emissaries of deities.As scientific knowledge advanced, human perception of the planets changed, incorporating a number of disparate objects.

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