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. Note: This animation shows a Cepheid variable star varying in brightness in the arm of a spiral galaxy. Animator: Dana Berry (Skyworks Digital). Writer: Michael D. McClare (HTSI).
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