as i said, 2,000 light years an hour is for slow, sluggish capital ships in the forerunners navy. they can make ships that can travel across millions of light years, that's dozens of times the range of a Jedi cruser's jump range. So you say they use a type of fuel? like we use oil? thats cute. You know what powers the halos?Reality. Quasi spacial reactors, micro universes ( but from perspective, the size of our universe) is created, harvested for energy, and decayed into quantum foam. think of it, an entire reality. think of how many stars, solar system, heck even galaxies are simply consumed. think of all the civilizations, an incalculable number of lives that have lived,died, and were born unbeknownst to them that they were just an energy source. Think of the matrix with the robots using humans as a power source except with entire universes across all time and space of that reality. oh, how many ships did you say the SW had, like 50 or something thousand, each capable of bombarding a planet's surface to smithereens? so can the covenant ships, let alone ancient humanity, forerunner, or precursor ships. you say that throughout all time, the SW universe would have a couple billion ships? The forerunners have a few billion ships themselves, wanna know a secret? [spoiler]those few billions of ships are at a single point in time, let alone their entire history. and that is just one of the races.[/spoiler]