"We live in a hot, expanding Universe. We also live in a Universe that on 'large' scales is homogeneous, the same at every point, and isotropic, the same in every direction. There is an ample (and growing) body of evidence for homogeneity and isotropy. The isotropy and homogeneity of the Universe is the most fundamental principle in modern cosmology. In fact, it is called the Cosmological Principle."