President Kennedy's announcement that an American would walk on the Moon before the end of the 1960s took the scientific world by surprise. The study of the Moon and planets had long fallen out of favor with astronomers: they were the stuff of science fiction, not science.

An upstart planetary laboratory in Tucson would play a vital role in the nation's grand new venture, and in doing so, it would help create the field of planetary science. Founded by Gerard P. Kuiper in 1960, the Lunar and Planetary Laboratory (LPL) at the University of Arizona broke free from traditional astronomical...