B Cosmic expansion

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Why should you prefer the view that cosmological expansion is due to distant galaxies moving apart according to the Hubble Law instead of cosmic space stretching, like stretching of space(-time) in the vicinity of black holes?
 
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Why should you prefer the view that cosmological expansion is due to distant galaxies moving apart according to the Hubble Law instead of cosmic space stretching, like stretching of space(-time) in the vicinity of black holes?
First, spacetime does not "stretch" near black holes. It is curved.

Second, "distant galaxies moving apart" and "spacetime being curved" are not two different things. They are just two different ways of describing the same thing.
 

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