Must be really weird to watch the apocalypse from space, seeing this massive meteoroid smash violently into earth but not hearing anything (because there are no (air) molecules in space; which means sound waves have no medium and cannot be carried to you).
Is that how you came up with "...silence"?
Or did you mean there would be silence after the apocalypse, because everything/everyone would be destroyed like others have mentioned? Or both? :P
Anyway great job on this, I like the idea behind it and the somewhat minimalistic approach is just lovely.