[i]I'm not worried about its power supply. I'm talking about how long it will take before it falls apart. A closed system will always fall into a state of entropy. If my memory is worth a damn, that's the Second Law of Thermodynamics. The Death Star is very much a closed system under the scenario I've suggested, where all life is eradicated from the galaxy. It's a question of whether a Halo or a Death Star can last longer without biological influence. [/i]