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The rings of Saturn and Titan
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The USS Enterprise hides from the Narada in Titan's atmosphere
Nova Squadron in orbit of Titan, secretly attempting the dangerous and forbidden Kolvoord Starburst
Titan is the largest moon of Saturn, the sixth planet in the Sol system and is named after the Titans, sisters and brothers of Cronos, the Greek Saturn, according to Terran mythology. Titan's diameter is nearly half that of Earth and it is larger than the planet Mercury; it is the only moon in the Sol system to posses an atmosphere which is largely composed of nitrogen and methane, with an atmospheric pressure of 1.6 bars and a mean surface temperature of approximately –178 °C.
Titan was the site of Human activity since at least the early 22nd century and as such, most likely fell under Federation protection and jurisdiction later on.
In the 2140s, while on Titan as part of the Omega training mission with Captain Jonathan Archer, Trip Tucker encountered problems while on an extra vehicular (EV) exercise. His EV pack froze up and he experienced nitrogen narcosis. However, Archer was able to convince Trip not to remove his helmet while still unsheltered on Titan's surface. (ENT: "Strange New World")
In an alternate reality, the crew of the USS Enterprise used the conditions on Saturn and Titan to help hide their ship from the sensors of the Narada. (Star Trek)
Titan was a major navigational reference within Saturn's planetary system. Nova Squadron used Titan as a rendezvous point before beginning training maneuvers during preparations for Starfleet Academy's commencement exercises in 2368. (TNG: "The First Duty")
Titan was also a favored way point for pilots making the Jovian Run. A dangerous shuttlecraft maneuver sometimes performed by Starfleet pilots on this run was called Titan's Turn. (TNG: "Chain of Command, Part II")