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Cepheid variable |
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Cepheid variable [ˈsiːfɪɪd] n (Astronomy) Astronomy any of a class of variable stars with regular cycles of variations in luminosity (most ranging from three to fifty days). There is a relationship between the periods of variation and the absolute magnitudes, which is used for measuring the distance of such stars How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Polaris is the nearest known Cepheid variable, a type of star used to measure the distances to other galaxies and the rate of expansion of the universe. In 1923, while observing the Andromeda nebula, he found that it contained a Cepheid variable, a star that regularly varies in brightness. used the Hubble Space Telescope to observe about 24 of the stars known as Cepheid variables. |
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