Definition of planet

Photograph of the crescent planet Neptune (top) and its moon Triton (center), taken by Voyager 2 during its 1989 flyby

The planets as understood before the acceptance of the heliocentric model

The definition of planet, since the word was coined by the ancient Greeks, has included within its scope a wide range of celestial bodies. Greek astronomers employed the term asteres planetai (ἀστέρες πλανῆται), "wandering stars", for star-like objects which apparently moved over the sky. Over the millennia, the term has included a variety of different objects, from the Sun and the Moon to satellites and asteroids.

单词	Classification of planets
释义	Classification of planets 英语百科 Definition of planet The definition of planet, since the word was coined by the ancient Greeks, has included within its scope a wide range of celestial bodies. Greek astronomers employed the term asteres planetai (ἀστέρες πλανῆται), "wandering stars", for star-like objects which apparently moved over the sky. Over the millennia, the term has included a variety of different objects, from the Sun and the Moon to satellites and asteroids.
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Classification of planets

Definition of planet