by Kip S. Thorne, Frederick Seitz, Stephen Hawking
by Stuart Gibbs
by Graham Hancock
by Barbara Marciniak, Tera Thomas
by Nicolaus Copernicus, Charles G. Wallis
by Erich Von Daniken, Daniken Von
by Paul Davies
by Martin Rees
by bell hooks
by Catherynne M. Valente, Ana Juan
by DK
by Carl Sagan, Ann Druyan
by Peter D. Ward, Donald Brownlee
by John D. Barrow, Frank J. Tipler, John A. Wheeler
by Troy Cummings
by Michael S. Schneider
by Neil deGrasse Tyson
by Dava Sobel
by John Carter Cash
by Barry McDonagh
by Guy Consolmagno, Dan M. Davis
by Guy Consolmagno, Paul Mueller
by Lois van Baarle, 3dtotal Publishing
by Stephen Webb
by Jacques Vallee
by Jeremy Barlow, Takeshi Miyazawa, Juan Fregeri
by Maia Kobabe
by Chronicle Books, NASA, NASA
by Neil deGrasse Tyson, Donald Goldsmith
by Carl Sagan