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Time is perceived as a continuum by some, and by others a constant, linear progression. Still others consider time to be more of a fluid, with currents and eddies that change as events are altered or changed. Regardless of one's definition, 'time' is almost always considered to be the 'fourth dimension' of space (the first three being physical location in space), signifying a change in location as time itself progresses.
- It can be speculated that it is this sense that is reflected in the name TARDIS, or Time And Relative Dimensions In Space.
One of the constants in most of the 'lesser races' of the galaxy has been that time, once passed, cannot be re-explored or revisited. This is not the case for the ancient race of Time Lords, who discovered fairly early in their development how to travel back and forth through Time.
Rassilon, in conjunction with Omega, discovered a way to pass back and forth through time by entering a structure known as the Time Vortex, a sort of pipeline that came into contact with every possible moment in time. The devices Rassilon invented to do this were known as TARDISes.
Though the advent of the TARDIS made time travel possible, it certainly did not make it easy or painless-- so much energy is required to make the journey that every TARDIS is powered by a black hole, known as the Eye of Harmony. If contact with this black hole is severed for any reason, a TARDIS can be considered 'dead'-- though it is possible to use emergency power to attempt another jump, doing so is risky at best. (DW: Rise of the Cybermen, The Age of Steel)
The Time Vortex was the primary means of transit through time by the Time Lords.
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