Classical Cepheid variable

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Classical Cepheids are a type of Cepheid variable star. They are young, population I variable stars that exhibit regular radial pulsations with periods of a fraction of a day to weeks, and visual amplitudes ranging from a few tenths of a magnitude up to about 2 magnitudes.

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

Image: Rursus, CC BY-SA 3.0, via Wikimedia Commons.