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Tidal locking

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Tidal locking occurred when a planet's orbit matched its year, meaning that one side always faced its star. This meant one side was always hot and bathed in sunlight and the other side was cold and always in darkness. This process tended to kill any life on the planet. New Rarga was a planet that was tidally locked. (PROSE: Ghost Devices) The First Doctor visited an Earth-like planet which was also tidally locked, although the exact term was not used. (COMIC: The Gyros Injustice) In planetary science, tidal locking is a phenomenon whereby the rotation period of a planetary body about its axis equals its orbital period. This means that one hemisphere of the planet always faces its parent or primary. Another example of a tidally-locked planet is Dytallix B, in orbit around Mira Antliae. This uninhabited planet was mined by the Dytallix Mining Company. Due to the extreme temperatures on both the day and night sides of the planet, the mines were located in the temperate zone between these hemispheres. (TNG: "Conspiracy" )

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In planetary science, tidal locking is a phenomenon whereby the rotation period of a planetary body about its axis equals its orbital period. This means that one hemisphere of the planet always faces its parent or primary. An example of a tidally-locked planet is Daled IV, which was described by Data, as a planet that "does not rotate." He further explained that "one side has constant night, the other constant daylight." He surmised that it was because of tidal locking that the two hemispheres on the planet developed disparate cultures, which may have been the major cause of the civil war on that planet. (TNG: "The Dauphin" ) Another example of a tidally-locked planet is Dytallix B, in orbit around Mira Antliae. This uninhabited planet was mined by the Dytallix Mining Company. Due to the extreme temperatures on both the day and night sides of the planet, the mines were located in the temperate zone between these hemispheres. (TNG: "Conspiracy" ) Other tidally-locked bodies include Ganymede, Luna and Remus. (TOS: "By Any Other Name" ; DS9: "Past Tense, Part I"; Star Trek Nemesis) While tidally-locked planets have been shown and used for story-telling purposes, the term "tidal locking" itself has not been used on-screen. For example, this phenomenon was used to explain why the Reman race preferred darkness in Star Trek Nemesis. Tidal locking occurred when a planet's orbit matched its year, meaning that one side always faced its star. This meant one side was always hot and bathed in sunlight and the other side was cold and always in darkness. This process tended to kill any life on the planet. New Rarga was a planet that was tidally locked. (PROSE: Ghost Devices) The First Doctor visited an Earth-like planet which was also tidally locked, although the exact term was not used. (COMIC: The Gyros Injustice)