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Could Cepheid Variables Help Measure the Hubble Constant?
💡 The Answer
- By measuring distances to galaxies with Cepheids, Hubble's law reveals expansion rate.
- Edwin Hubble himself used Cepheids in the Andromeda Galaxy to prove it was separate.
- Modern observations of Cepheids in Type Ia supernova host galaxies refine H₀.
- Tensions between Cepheid-based H₀ and cosmic microwave background values hint at new physics.
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