Again, the sheer fact a mere planet survived a blast that obviously was not that great a distance away, shows the blast wasn't anywhere close to being remotely galaxy-busting and you have yet to prove otherwise. Aside from that I do believe that in Kingdom Come Captain Atom, when he exploded after being torn into by the Parasite, the energy unleashed as akin to, perhaps, a million nuclear warheads. And all that did was vape Kansas. I could be wrong though. It may not be a million, but it was around there. I mean, for a long time people said he had the power to create a universe, and when his Monarch version (Prime-verse I think) exploded he did destroy the Universe. And yet, KC Atom only took out...Kansas. That was sad.