Mass vs distance

Dear Group,

Could it be excluded that the Hubble red shift and the greater than expected
rotation rate and implied increased mass of distant galaxies could be
explained by mass decreasing with time?

Evidently a large amount of the mass of the universe must have been
converted to radiation over the aeons, but although every photon is
presumably absorbed eventually, there must be a huge amount of energy in
transit in the universe, representing a considerable mass. If this
represent a mass density distributed throughout the universe, is it a
significant factor in cosmology?

All the best

Ian Macmillan

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