In 2087, a spacecraft is sent to Europa, the second of the four satellites of Jupiter first seen by Galileo, to look for life in the saltwater ocean underlying the icy surface of that frigid moon. It is not an easy journey, and the crew of eight seasoned astronauts face a number of difficulties on that long and dangerous voyage. The expedition is followed by all mankind with mixed feelings as it proceeds to attempt an answer to the age-old question:...