Using interviews with and writings by astronauts and cosmonauts, discusses how viewing the Earth from space and from the moon affect space explorers' perceptions of the world and humanity, and how those changes are likewise felt in contemporary society. The author views space exploration and eventual colonization as an inevitable step in the evolution of human society and consciousness, one which offers new perspectives on the problems facing us down here on Earth. Annotation copyrighted by Book News, Inc., Portland, OR