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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
universe
research news
nebulae
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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.
