What was Hubble's initial calculated distance to Andromeda around 1924-1925?
Answer
Approximately 900,000 light-years
Following his analysis of the measured periods and the application of the Period-Luminosity curve, Hubble published findings around 1924-1925 placing the Andromeda Nebula at a distance of roughly 900,000 light-years. This figure was critically significant because it was substantially larger than the accepted diameter of the Milky Way at that time, which was estimated to be around 100,000 light-years. Although later refinements, based on improved calibration constants and the Hubble Constant, increased this estimate closer to 2.5 million light-years, the initial 900,000 light-year measurement served its purpose in confirming Andromeda's extragalactic status.
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