What is the essence of Hubble's Law, relating recessional velocity ($v$) and distance ($d$)?
Answer
$v = H_0 d$, implying recessional velocity is directly proportional to distance.
Hubble's Law encapsulates the fundamental empirical relationship discovered when plotting recessional velocity against distance for numerous galaxies. The essence of this law is a direct proportionality: the velocity ($v$) at which a galaxy recedes is equal to a constant ($H_0$, the Hubble Constant) multiplied by its distance ($d$). Mathematically represented as $v = H_0 d$, this equation signifies that if a galaxy is twice as far away, it moves away approximately twice as fast. The Hubble Constant, $H_0$, quantifies the current rate of universal expansion based on these observed linear relationships.
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