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Cepheid Variable Star in Galaxy M100


Depicts: Cepheid Variable Star
Copyright: Dr. Wendy L. Freedman, Observatories of the Carnegie Institution of Washington, and NASA

The interval it takes for the Cepheid to complete one pulsation is a direct indication of the stars's intrinsic brightness. This value can be used to make a precise measurement of the galaxy's distance, which turns out to be 56 million light-years from Earth. This images was taken on May 20, 1994.
Last Update: 1 September 2019
16-Feb-2026 23:14 UT

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