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Andromeda Nebula |
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The first of these galaxies was shown to exist when
Edwin Hubble resolved the stars of the Andromeda nebula in 1923, with
the help of then newly built 100-inch telescope at Mt. In 1923, while observing the Andromeda nebula, he found that it
contained a Cepheid variable, a star that regularly varies in
brightness. |
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