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Did Cepheid Variables Help Discover the Expansion of the Universe?
š” The Answer
- Edwin Hubble used Cepheid distances to show galaxies recede faster the farther they are.
- His 1929 paper relied on Cepheid calibrations by Henrietta Leavitt and others.
- This discovery led directly to the Big Bang theory and modern cosmology.
- Cepheids remain essential for measuring the universe's expansion rate today.
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