Pretty good.
Personally I think the snare sounds too light. In the beginning it sounds a bit like a... oooh what are those things called... the little tappy things used for morse code... You know what I'm talking about, right? Other than that, nice orchestration, sounds pretty nice. I don't get the image of a supernova with this song though, I get something more like a medieval town preparing for war or something. haha. Probably just because of the classic genre. Good work.