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Marcus Chown is an award-winning writer and broadcaster. Formerly a radio astronomer at the California Institute of Technology in Pasadena, he is cosmology consultant of New Scientist. His books include The Ascent of Gravity, which was The Sunday Times Science Book of the Year 2017; What A Wonderful World and Quantum Theory Cannot Hurt You. His contribution to The Ladybird Experts Series, Big Bang, is published on Thursday 22nd March by Michael Joseph, Hardback, £7.99.