What was the approximate numerical value for the Hubble Constant ($H_0$) calculated by Hubble in his early publications around 1929?
Answer
Around $500 ext{ km/s/Mpc}$
Hubble's initial calculations, published around 1929 after correlating Slipher's velocities with his own distance estimates, resulted in a value for the Hubble Constant ($H_0$) significantly higher than current measurements suggest. His early estimate placed $H_0$ around 500 kilometers per second per megaparsec (km/s/Mpc). This large expansion rate led to a derived age for the universe of approximately 2 billion years, which was problematic because geological evidence confirmed the Earth itself was already older than that calculated age.
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