In Edwin Hubble’s initial linear expansion relationship, $v = H_0 d$, what specifically does the term $H_0$ represent?
Answer
The Hubble Constant.
The fundamental relationship describing the uniform expansion of the universe observed by Edwin Hubble is mathematically expressed as $v = H_0 d$, where $v$ is the recession velocity of a galaxy, and $d$ is its distance from the observer. The proportionality constant linking these two variables is designated as $H_0$, which is known as the Hubble Constant. Although the HST refined the understanding of this relationship by introducing acceleration and better calibration, this initial formulation provided the foundational understanding of how spatial expansion dictates recession velocity based on distance, forming the bedrock of modern cosmology.
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