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