"We'll thunder off to Io, Out in the Jovian Moons. We'll feast our eyes and seek the skies And plunder Martian ruins " The "Spaceman's Chant" turned from a spirited to a heartbreaking refrain when Cadet Peter Hodges learned that he would never be allowed to "thunder off to Io." Bitter disappointment, to a youth whose father had been one of the first space captains, motivates this gripping tale of the future. Studded with detail of the spaceports,...