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Martin Rees is the United Kingdom’s Astronomer Royal. He is based at the University of Cambridge where he is a fellow (and former master) of Trinity College. He is a member of the House of Lords, co-founder of the Centre for the Study of Existential Risk at Cambridge (CSER) and a former president of the Royal Society. His research interests include space exploration, black holes, galaxy formation, and speculations about a multiverse and prospects for extraterrestrial life. In addition to more than 500 research papers, he has written many general articles and 10 books.