- last post: 01.01.0001 12:00 AM PDT
This is good stuff. 25,000 light years in each direction would mean a sphere with a diameter of 50,000 light years, so maybe less than thirteen IF you assume the blast radius is a sphere. If it's flatter (which now that you mention it makes more sense due to Halo's ring shape), then yeah I can see it taking more.
As far as the comment about the 4/13/however many rings decimating the entire universe (in an earlier post by someone else), since the universe is 12 or so billion years old, that means it's 12 billion light years in each direction from the center. I think it would take a more than just a few rings at 25,000 ly to nuke everything.
As far as the TYPE of blast concerned, I would think it would be more of a radiation surge kind of thing, as in the invisible gamma/cosmic ray kind of thing (i.e. not some big fireball, and nevermind the fact you can't have fire without oxygen or some other oxidizing equivalent); it would make sense that radiation might not kill the flood since they already appear to be pretty mutated as is. The lethal dose of radiation would kill all life, but possibly the flood may be immune.