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The terms in bold link to topics in the AQA, Edexcel, OCR, WJEC and CCEA A-level specifications, as well as the IB, Pre-U and SQA exam specifications.
The luminosity of Cepheid variable stars, given by the Stefan-Boltzmann law, varies periodically. These stars are used to measure cosmic distances, alongside methods such as stellar parallax, and to provide evidence for the expansion of the universe according to Hubble’s law.
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