NASA
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 Highers/Advanced Highers exam specifications.
The story of the discovery and calibration of the period–luminosity relationship for Cepheid Variable stars involves logarithmic graphs and an inverse-square law. The relationship underpins an important standard candle method for astronomical distance measurement.
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