If the laws of physics as we understand them hold true, then by definition we (or any other observer anywhere) are at the centre of the universe they see, insomuch as the further away we look, the further back in time we look, in all directions, back to the beginning... or something along those lines. Unless we find we can circumvent the rules we know now, or that they don't hold true, anything outside our light-cone, outside our observable universe by definition cannot be shown to exist.