THe explanation I read was that the ship was "warped" into an alternate dimmension where the speed of light was faster than in ours.
In any event, trying to explain science fiction technology with modern science is ridiculous. Imagine Isaac Newton (surely a brilliant individual) trying to explain how a smart phone works after seeing its use in a weeks worth of TV shows, including all the contradictory information we get there like how they never work in tunnels (when convenient), but do work in a mineshaft (when convenient).