What proportionality did Hubble establish in 1929 concerning a galaxy's recessional velocity and its distance from Earth?
Answer
The recessional velocity of a galaxy was directly proportional to its distance from Earth.
The breakthrough observation published by Hubble in 1929 was not merely that galaxies were moving away, but the systematic manner in which they were receding. He demonstrated a direct proportionality: the farther away a galaxy is located from our position, the faster it is observed to be moving away from us. This relationship implies a large-scale, systematic motion affecting all observed galaxies. This finding crystallized into Hubble's Law, forming the observational backbone for understanding the large-scale structure and dynamics of the cosmos.
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