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How did Edwin Hubble use Leavitt's relation to prove the Andromeda nebula lay outside the Milky Way?
Big Bang Theory
Galaxies and Large-Scale Structure
Stellar Astrophysics
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Death of Henrietta Swan Leavitt
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Related questions
How did Genzel and Ghez track individual stars to prove something massive and invisible sits at the centre of the Milky Way?
How did Harlow Shapley use Cepheid variable stars to measure distances to globular clusters?
How did Leavitt's period-luminosity relation later enable Edwin Hubble to measure the scale of the universe?
How did Maarten Schmidt realize the strange emission lines in 3C 273's spectrum were actually redshifted hydrogen?
How did Shapley later use Cepheid distances to argue that the Sun sits far from the center of the Milky Way?
How did William Fowler's nuclear physics work explain where elements heavier than hydrogen come from?
How far did Hubble calculate Andromeda to be, and why did that distance settle the debate?
What did Fred Hoyle's B2FH paper explain about how stars forge the elements heavier than helium?