> If there’s a persistent bias in the galaxies that are in our data set or there’s a bias in the person of the local portion of the universe we can observe, the

> If there’s a persistent bias in the galaxies that are in our data set or there’s a bias in the person of the local portion of the universe we can observe, then the sample isn’t random. The Copernican principle is the default, unless we have some reason to doubt it in a particular case.