What was Hubble's approximate initial estimate for the Hubble Constant ($H_0$) based on his $1920$s data?
Answer
About $500 ext{ km/s/Mpc}$.
Hubble's initial calculations from the 1920s yielded a value for the Hubble Constant in the range of approximately $500 ext{ km/s/Mpc}$, which suggested a much younger and smaller universe than current models estimate.
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