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period-luminosity relation
[ peer-ee-uhd-loo-muh-nos-i-tee ]
noun
, Astronomy.
- the relationship between the period of light variation and of the absolute magnitude of Cepheid variable stars.
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Word History and Origins
Origin of period-luminosity relation1
First recorded in 1945–50
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Example Sentences
Hubble was able to use his measurement of Cepheids and Leavitt’s period-luminosity relation to prove definitively that the Cepheids in Andromeda and several other nebulae were much too distant to be inside the Milky Way.
From Scientific American
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