Well, in more formal terms, cosmology has the 'cosmological principle'[0], which is a conjecture that at large enough scales, the universe is universally isotropic and homogenous wrt the distribution of matter. Basically that it should average out to the same density everywhere, and should look basically the same in terms of how much matter there is from wherever you pick.

There'd be a lot of cosmology glory in proving that wrong. They'd put your name before Hubble's.

[0] - https://en.wikipedia.org/wiki/Cosmological_principle