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How much fainter in apparent brightness is the z = 0.8 supernova explosion in cosmology (3) (m = 0.3, = 0.7) as opposed to

How much fainter in apparent brightness is the z = 0.8 supernova explosion in cosmology (3) (Ωm = 0.3, ΩΛ = 0.7)

as opposed to cosmology (1) (Ωm = 1, ΩΛ = 0).

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