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From Warhammer 40k - Lexicanum
Warp
,→Warp Travel
The Warp is an important factor in the survival of the human race. Spacecraft, capable of voyaging thousands of light-years in a matter of days, travel across the Warp. By such fragile means, humanity is bound together in a single Imperium. The Emperor's will may be mighty, but his reach is long only because Warpspace may be crossed by his fleets.{{Fn|1}}
A spaceship may enter the Warp through the use of [[Warp drive]]s. This is the means by which spacecraft effectively travel faster than the speed of light. This is achieved because Warpspace is a domain of pure energy, where spacecraft can navigate between streams, as in an ocean. The Imperium use uses [[Navigators]] - special , a sub-race of humans - , for this purpose. Time also proceeds a great deal slower - or faster- in the Warp than in the material universe, creating a form resulting in forms of time stasis, acceleration, reversal, and other chaotic violations of physics. While this solution is effective, it is far from perfect.{{Fn|3}}
Long-distance journeys take months or even years, and the timing itself is unpredictable due to the very nature of the Warp.{{Fn|3}}
