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The Hubble Law is just a approximation for "small" scales. When you look for a large scales the scale factor is like $$a(t) = a(t_0)[1+H_0(t-t_0) + ...+]$$ So, you have another contributions to the scale factor, which affects the value of the hubble's parameter. So, this parameter is not a angular coefficient of a line. If it would were so the constant ...

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