By Alex Gordon Smith
By Carlo Rovelli
By John Gribbin
By Buzz Aldrin, Leonard David
By Carl Sagan
By Michael Carlowicz
By Bell, Steve
By Harry Collins (Professor, Cardiff University)
By Wallace Arthur
By Paul Weissman, etc., Lucy Ann McFadden (University of Maryland, College Park, USA), Torrence Johnson (Jet Propulsion Laboratory, Pasadena, California
By Kenneth R. Lang
By John N. Bahcall
By Smith, Peter, Begg, David
By Bishop, Nic, Bishop, Nic, Collins Big Cat, Moon, Cliff
By SEYMOUR SIMON
By Peter Francis
By James Dashner
By Ian Ridpath, Wil Tirion
By Laurence Bergreen
By Oliver Morton
By Burton Taylor
By Gerald North
By CBE, DSC, FRAS, Sir Patrick Moore
By Gribbin, John
By Duncan G. Steel
By Professor Pedro G. Ferreira
By Stephen Hawking
By Patrick Moore
By Brian Jones