Martin Rees is Professor of Cosmology and Astrophysics and Master of Trinity College at the University of Cambridge. He was the President of the Royal Society until 2010, and is the Astronomer Royal. A member of the House of Lords, he is a foreign associate of the National Academy of Sciences and the American Academy of Arts and Sciences, and is an honorary member of the Russian Academy of Sciences. His awards include the Gold Medal of the Royal Astronomical Society, the Einstein Award of the World Cultural Council and the Crafoord Prize (Royal Swedish Academy). He was the recipient of the 2011 Templeton Prize. Martin's latest book is From Here to Infinity: Scientific Horizons, which expands on hIs 2010 BBC Radio 4 Reith Lectures. THIS PROGRAM WAS THE 200TH EDITION OF LITTLE ATOMS. First broadcast on 3rd June 2011.