For the halo universe, you don't have to take calculation to obstacles in the way, by using real time calculations with planetary coordinates, the covenant ( not even the most advanced race to begin with) could predict where a planet, or a specific spot in a solar system, would be with a discrepancy of a [b]single atom.[/b] The forerunners or precursers? Spot on, no errors at all. Ever played portal? Slipspace is like traveling through the two portals, every real word obstacle is ignored. Also, 2,000 light years an hour is for a heavy war ship. If we really wanted to measure speed. The forerunners sent an exploration ship to a nearby galaxy for research on a possible flood origin. A jedi cruiser ' s hyper drive has a range of 60 thousand light years, this galaxy was a couple MILLION light years away. The book didn't even give a specific top speed for the forerunner expedition vessel. Forerunners transit system is so fast, they were actually limited by the laws of physics of the slipspace dimension. Also, may I ask what does the SW universe use to power their ships? I would like to know before I give my answer to this question for the forerunners.