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Astronomy · L3 · The Cosmic Distance Ladder

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How parallax, Cepheid variables, and Type Ia supernovae each calibrate the next rung, extending out to Hubble's law.

by @openstemUpdated Astronomy
Parallax: nearby starsCalibrates Cepheid period-luminosity relationCepheid variables: to ~100 million light-yearsCalibrates Type Ia supernova peak brightnessType Ia supernovae: billions of light-yearsCalibrates Hubble's law: v = H0 dHubble's law extends to the observable Universe

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