Cepheid Variable in Spiral Galaxy

  • Released Tuesday, July 3, 2007
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A Cepheid is a star that varies in light intensity over regular, measurable periods. The period of pulsation is directly related to a Cepheid's intrinsic brightness making observations of these stars a powerful tool for determining distance. This animation shows a Cepheid variable star varying in brightness in the arm of a spiral galaxy.


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This page was originally published on Tuesday, July 3, 2007.
This page was last updated on Wednesday, May 3, 2023 at 1:55 PM EDT.


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