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Luminosity Curve |
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 The
curve of luminosity of the first Cepheid variable star discovered by Edwin
Hubble in the Andromeda Nebula, M31. Using this he could determine the
nebula's distance. Hubble included this graph in his 19 February 1924
letter to Harlow Shapley.Copyright uncertain, see this note. |
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 Copyright ©. Brought to you by the Center for History of Physics, a Division of the American Institute of Physics |
