While the "science" isn't really all that good, the premise is basically this: any given quanta of matter only has a probability of existing at a particular intersection of space and time. While the probability of this quanta existing elsewhere is incredibly tiny, it is fair to say that it is non-zero. Since this quanta (literally matter so tiny you cannot sub-divide it further) is so incredibly small, then it would stand to reason that an object as a whole has a probability of being somewhere else but formerly infinitesimal probability becomes even less likely by an unimaginable magnitude and yet, it is still not quite zero (it is however, effectively zero as it becomes so unlikely that it is unlikely to happen in the entire history of the universe).Daveman said:Yes I understand probability but that still doesn't explain how it translates the probability into movement which is probably because that's just stupid... and then there's also this. http://www.earthstar.co.uk/bistro.htm
And that's why Douglas Adams is the greatest human being ever.
Basically, by manipulating this probability in some fashion, the ship manages to exist at all places at the same time. Then, magically, it determines exactly what probability would have them arrive at a given location and the ship arrives there.
Is it good science? Certainly not. There is no reasonable explanation for how the drive manipulates the probability in the first place. There is no explanation for how it distinguishes which spot is "right" as, at infinite improbability the ship literally exists at every possible point at every possible time simultaneously and everyone one of those points is equally correct. But the explanation as a whole at least seems plausible in a universe where god is banished in a puff of logic and there are brain wave eating fish that perform universal translation services in exchange. In short, it is a suitable explanation for the universe because it at least hints at something scientific, doesn't bother getting bogged down in the tedious details (as such would almost certainly harm the humor in the story) and doesn't result in an answer that makes you immediately say "well, that's not right at all!".
Science Fiction is, rarely, based on actual science. Generally, it endeavors to deliver an explanation that is reasonable for just long enough to move past a given part of the plot. Is a Heisenberg compensator a reasonable explanation for teleportation in Star Trek? Sure, as long as you don't demand to be told just how a Heisenberg compensator works. Basically, what we have is something fantastic because, currently, we have no way of knowing how to overcome a very persistent problem (you can know the position or the direction and rate of travel of a particle, never both at the same time). This problem makes teleportation, as we see it in Star Trek, impossible. The resolution is simply to say, well we can ignore that problem because of a mcguffin that resolves this sticking point. This works because the important problem (teleportation) was resolved in a satisfactory method, even if a lesser problem (the uncertainty principle) was resolved without explanation.