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How to discover a planet

By Christopher Watson, Professor, Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast
Annelies Mortier, Associate Professor in Astronomy, School of Physics and Astronomy, University of Birmingham

In the 30 years since the discovery of 51 Pegasi b, more than 6,000 planets outside our Solar System have been catalogued. Two modern-day explorers explain how.

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