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According to Hubble's law, the redshift (Z) of a receding galaxy and its distance $r$ from earth are related as
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$\mathrm{Z} \propto r$
Hubble's law is a statement of a direct correlation between the distance (r) to a galaxy and its recessional velocity as determined by the red shift (Z). It is stated as $Z=H_0 r$, where $Z=$ recessional velocity
$H_0=$ Hubble constant and $r=$ distance.
$H_0=$ Hubble constant and $r=$ distance.
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