Carl Sagan. NY: Random House, 1994. xviii + 429 pp. $22.00. IN 1972, DURING THE LAST VOYAGE by humans to the moon, the Apollo 17 astronauts took the famous photograph of the whole Earth that has become an icon of the 20th century. That image gave us a new perspective on our place in the universe. According to Carl Sagan, "The Apollo pictures of the whole Earth conveyed to multitudes something well known to astronomers: On the scale of worlds--to say nothing of stars or galaxies--humans are inconsequential, a thin film of life on an obscure and solitary lump of rock and metal" (6). In 1990, Vo...
