What relationship does Hubble's Law mathematically express between a galaxy's velocity ($v$) and its distance ($d$)?
Answer
A galaxy's velocity is proportional to its distance from the observer ($v = H_0 d$)
Hubble discovered a direct proportionality between the measured distance of galaxies and their recession velocities. This relationship, known as Hubble's Law, is expressed as $v = H_0 d$, where $H_0$ is the Hubble Constant.
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