Could the cosmological redshift be due to the strong gravitational fields of nearby galaxies instead?
It seems that I have answered this in several previous questions: The redshift and the cosmic fireball The redshift and gravitating matter The redshift and the gravitational fields of quasars The point is that the amount of mass needed in each galaxy to produce the magnitude of the redshift seen, by purely gravitational means, is thousands of times greater than the mass of the Milky Way. This is inconsistent with the speeds found in distant binary galaxies which indicate typical galaxy masses not much different than the Milky Way or smaller. Just as general relativity predicts the gravitational redshift, which is by the way seen in Neutron stars and white dwarf stars, it also predicts cosmic redshifts due to the dilation or expansion of space. Both are ‘natural’ and simple predictions by general relativity and are accorded equal weight.
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