Steve Nolan was three years dead, pyro-burned in the black space off Luna when a prison break failed. But Nolan had a job to do. Nolan came back. Where the Avalon Trail bends across Annihilation Range, a thousand icy miles from Pluto's northern stem, Nolan stopped and closed the intake valve of his helmet. Count five seconds, and he unhooked the exhausted tank of oxygen; count ten more and it was spinning away, end over end over Pluto's frozen surface, and a new tank was already in place. He sli