In the cosmological principle, we can easily test cosmic homogeneity with the redshift surveys, but isotropy cannot be so tested.

Name: In the cosmological principle, we can easily test cosmic homogeneity with the redshift surveys, but isotropy cannot be so tested.
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Both cosmic homogeneity and isotropy are tested and supported by observations such as redshift surveys and the Cosmic Microwave Background (CMB) radiation, indicating the universe is both homogeneous and isotropic on large scales.

In the Cosmological Principle, We Can Easily Test Cosmic Homogeneity