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It is sometimes said that the universe is homogeneous and isotropic. What is meant by each...

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Physics

It is sometimes said that the universe is homogeneous andisotropic. What is meant by each of these descriptions? Are theymutually exclusive, or does one require the other? And whatimplications rise because of this?

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A homogeneous cosmology is one in which there are no special places in the universe at a given instant in time the universe appears the same at every location on large enough spatial scales An isotropic cosmology is one in which there are no special directions at a given instant in time    See Answer
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