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.
Some stars are travelling at speeds that are a significant fraction of the speed of light. The fastest are in close orbit around the black hole at the centre of the Milky Way galaxy. These orbits can be described using Kepler’s laws, although Newton’s theory of gravity is only approximately true for these orbits, and a detailed analysis requires Einstein’s general relativity. Others are accelerated by an interaction with the black hole, receiving a ‘slingshot’ that can eject them from the galaxy.
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