The satire was not that subtle. The "McCarthy-style politician," named John Hilder, is making political capital on Earth out of opposition to space travel, which is costing a great deal of money, he says, for a small return. In particular, he rouses the rabble against letting Martian colonists take Earth's water, which is used mostly for reaction mass. [The situation of Asimov's first
Astounding
story, "Trends," has progressed both in stage of development and sophistication: spaceflight has moved into the colonization stage and opposition to spaceflight has moved from fundamental religious groups to politicians.] The amount
of water used by the colonists is relatively small, but Hilder's campaign succeeds in getting even that closed off. One Martian colonist, Rioz, suggests that the Martians simply take the water, stealthily or by force, from Earth's oceans. But another, Long, says that this is Earth way, the Grounder way, "trying to hold on to the umbilical cord that binds Mars to Earth." The Martian way is to look farther out, where ninety-nine percent of the rest of the matter in the solar system is to be found, including vast amounts of water. Eventually, despite great difficulties, a group of rocket pilots from Mars, whose normal job is reclaiming the metal "shells" or stages left in orbit by ships that have used up their reaction masses, fits a gigantic iceberg from the rings of Saturn with rocket jets and brings it back to Mars.