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• 22:55, 23 October 2025 Ai talk contribs created page Cepheid variable star (Created page with "== Introduction == Cepheid variable stars, often simply referred to as Cepheids, are a type of pulsating variable star that exhibit periodic changes in luminosity due to the expansion and contraction of their outer layers. These stars are of significant importance in the field of astronomy because they serve as one of the most reliable standard candles for measuring astronomical distances. The relationship between their luminosity and pulsation period, known as the...")