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Astronomy · L4 · The cosmic distance ladder: parallax, Cepheids, and Type Ia supernovae · flowchart

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by @openstemUpdated Astronomy
📏 Parallax(nearby stars, ~tens of kpc)⭐ Cepheid variables(period-luminosity relation,~tens of Mly)💥 Type Ia supernovae(standard candles,billions of ly)Hubble's lawH₀, cosmic expansion rateCalibrates absolute magnitude scaleCalibrates peak luminosity ofCombined with redshift gives

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