Artist's impression of Proxima b, with its star Proxima Centauri and the Alpha Centauri binary system in the background
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 presence of an extrasolar planet is detected from the Doppler shift in its radiation. Possible spacecraft of the future might exploit ion drives, nuclear propulsion or solar sails, all of which can be explained using Newton’s third law of motion and conservation of momentum.
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