What fundamental relationship between velocity ($v$) and distance ($d$) did Hubble publish in $1929$?
Answer
$v = H_0 d$ (Hubble's Law).
Hubble published his analysis showing a clear, linear proportionality between a galaxy's recessional velocity and its calculated distance, formalized as $v = H_0 d$, which provided the first quantitative proof of cosmic expansion.
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