Graphic of an accretion disk around a black hole (a quasar)
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 specifications.
Measurements of quasar redshifts deduced from their emission line spectra, and their interpretation using Hubble’s law, helped to produce evidence relating to the Big Bang and Steady State theories of the universe.
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