Around what time did Hubble present his initial findings confirming Andromeda's distance?
Answer
1924
Hubble conducted his concentrated photographic survey of the Andromeda Nebula (M31) in late 1923 or early 1924, during which time he successfully identified the pulsating Cepheid variable. After tracking the star long enough to establish its period and thus its intrinsic brightness, he calculated the distance. His initial findings, which definitively proved Andromeda was extragalactic, were presented to the scientific community in 1924, resolving the central question of the Great Debate.
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