The problem with the existing system of space travel - star gates - is that they are slow, bulky and immobile. A star gate is a city in space. It exists solely to move ships from one star gate to another located somewhere else. Travel is not instantaneous with a star gate. A ship travels effectively one adjusted-parsec (pc) per week (.165 light years per week). For example, the Human star system, Sol is 8pc away from Alpha Centauri and hence would take eight weeks to reach it.