Okay. So Star Wars can't jump to light speed because opening a wormhole is impossible as it requires the existence of negative mass, which is nonsense. Jedi can't use light sabers or the force, the former because the heat from the plasma blade would melt the users hand, and the latter because it actively ignores the laws of physics. The star forge and sun crusher is out because the Forge would superheat and melt from such close proximity to the star, and the sun crusher is out because the energy necessary to destroy a star is far, far too large for its small missiles to achieve--the Bekenstein Bound says hi. The Death Star is out because unless it is made out of neutron star material, no material can maintain structural integrity of an object that size with a small star burning at the heart of it (the necessary energy reserves to destroy a planet). If it IS made out of neutron star material, no one could stand on it without being pulverized. Anymore questions? Halo works for two reasons. The first is that the halo energy propagates on cross phased supermassive neutrinos. Neutrinos are only effected by the weak nuclear force and gravity, both of which are too weak to meaningfully impact it, meaning the energy passes through almost anything undeterred; all it needs to do is shut down the nervous system of complex organisms, which it can do on the molecular scale. Combine that with Forerunner's temporal manipulation tech, and the Rings hit their target the instant they are fired, regardless of space, mass or time. The other reason they work is because it's called science [i]fiction[/i]. Deal with it.