By John Gribbin
By Martin Rees
By Storm Dunlop, Wil Tirion, Royal Observatory Greenwich, Collins Astronomy
By Marcus Chown
By Stuart A. Kauffman
By Dr Gordon Strachan
By Ian Ridpath, Martin J. Rees
By Stephen Hawking (University of Cambridge)
By Colin A. Ronan
By Michio Kaku
By P. C. W. Davies
By Noel Edmonds
By David Christian
By Vincent Cronin
By Neil Gunn
By Priyamvada Natarajan
By Ritchie, Rob
By Giles Sparrow
By Michael Wall
By Dr Sten Odenwald
By Lisa Randall
By Frank Wilczek (Author)
By Tom Kerss, Royal Observatory Greenwich, Collins Astronomy
By George Musser
By Frank Close (Professor of Theoretical Physics and Fellow of Exeter College, University of Oxford)
By Richard Morris, Morris, Richard
By Irvine, John M.
By Rees, Martin
By Barrow, John D., Morris, Simon Conway, Freeland, Stephen J., Harper Jr, Charles L.