ILLUSTRATION CREDITS

22	Alan Dunn The New Yorker Collection/The Cartoon Bank
40	© Frank Drake
57	© NASA
62	© Bettmann/Getty Images
82	© NASA
102	© W. Robert Moore/National Geographic/Getty Images
108	© NASA
119	Sputnik/Science Photo Library
126	Photo courtesy of the Estate of Lynn Margulis
142	© Acey Harper/the LIFE Images Collection/Getty Images
176	Courtesy of the Archives, California Institute of Technology
181	David Nunuk/Science Photo Library
207	© Byurakan Observatory