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Cepheid Centenary and the Expanding Universe
https://armaghplanet.com/cepheid-centenary-and-the-expanding-universe.html
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galaxy
hubble
nebula
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nebulae
On October 5, 1923, Edwin Hubble identified the first Cepheid variable in M31, the Andromeda Galaxy. This proved that the Andromeda nebula was not part of the Milky Way and paved the way for measuring the expansion of the Universe.
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