Based on the formerly proposed model of the time and universe, a time-course of the light speed along with the expansion of the universe is discussed. Formulas of light propagated distance of a supernova are derived, whose graphs showed an excellent consistency to the observed supernovae data. This outcome verifies that the universe has been expanding at a constant speed by our observed time as the model predicts.

The universe has been expanding at a constant speed, as predicted by the model, with observed supernovae data showing excellent consistency.

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Light speed and the expansion of the universe

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