COMMENTARY | During the Republican presidential debate in Jacksonville, Fla., Thursday night, the subject of Newt Gingrich's moon colony idea came up. During the exchange, Mitt Romney especially revealed a smallness of vision and an ignorance of the issue. [snip]If Romney wants to know why Gingrich is so focused on the moon, he could go no further than to read Paul Spudis' The Case for Renewed Human Exploration of the Moon" in which the rationale for returning to the moon, not only for science, but also as a prelude to the exploration of the Solar System is examined. Spudis also...