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'''Planet''' was the common designation for a certain type of celestial body orbiting a [[star]]. They occurred in a great variety of different compositions, masses, and surface conditions. The exact definition of what constituted a planet varied among cultures.
Within the [[United Federation of Planets]], celestial bodies with diameters below 100 [[kilometer]]s kilometers are usually classified as [[planetoid]]s or [[asteroid]]s rather than planets.
The final appearance of a planet depended on its formation process, which meant where and under what circumstances it formed. Planets could accumulate gigantic [[atmosphere]]satmospheres, exceeding their original size and mass, or they could rest without any atmosphere at all. With a sufficient mass, a planet was able to accumulate so much [[gas]], that it started to undergo [[nuclear fusion]], turning into a [[protostar]]. In this state it began to emit [[energy]], as its core temperature and density increased. Planets could also be changed to a [[Class M]] environment by [[terraforming]].
The Federation had numerous different [[planetary classification|classifications for planets]] depending on their mass, composition, surface environment and atmospheric compounds.
