Quest to Centaurus by George O. Smith

"Pluto," said Al Weston drily. He'd come through the entrance dome of one of the sealed cities and was standing atop the Corps Administration building, looking out over the sprawling city. Since Pluto was utterly cold, the sealed cities were the only habitable places on the planet and even they were too chilly for comfort.

He had no Pluto-garb, but he did have his spaceman's suit, which was internally heated. He, like most of the Corpsmen there, wore the spaceman's suit with the fishbowl swung back across his shoulderblades.