Cepheid variable

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A Cepheid variable () is a type of variable star that pulsates radially, varying in both diameter and temperature. It changes in brightness, with a well-defined stable period (typically 1–100 days) and amplitude.

Excerpt from the Wikipedia article “Cepheid variable”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: NASA, ESA, and the Hubble Heritage Team (STScI/AURA)-Hubble/Europe Collaboration; Acknowledgment: H. Bond (STScI and Penn State University), Public domain, via Wikimedia Commons.