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2026
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Source-derived question
Why did confirming a physical pulsation mechanism matter for trusting the period-luminosity relationship as a cosmic distance ladder?
Big Bang Theory
Stellar Astrophysics
Sources that address it
Shapley finds spectral variations in Cepheid variables
almanac
Related questions
How did Edwin Hubble use Leavitt's relation to prove the Andromeda nebula lay outside the Milky Way?
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