He settled into Stone’s seat, at the left-hand side of the cabin, and stuck his checklist to a Velcro square on the control panel in front of him. He had a little foil tube of orange juice in the top pocket of his Beta-cloth coveralls, and he dug that out, pulled out the straw, and took a sip. He adjusted his headset and made sure he had a working comms link to the rest of the Ares cluster — both York and Stone responded from intercoms in the Mission Module — and he fired off a call to Fred Haise, who was the capcom on the ground. He didn’t wait for his signal to crawl across the Solar System to bring him a reply before beginning work, however.

He began to power up Apollo’s systems.

During the transfer to Mars and back, all but essential systems were quiescent on Apollo. There were umbilical connections through the docking system which hooked up Apollo to the main solar panel arrays, so Apollo didn’t have to run on its own power. Every fifty days or so, Gershon was supposed to go through this routine of checking Apollo’s systems. He was making sure they would be working when it came time for the crew to ride Apollo home, back down through the air of Earth.

The chore took maybe 40 percent of his attention.

He dug a cassette tape out of his pocket and slid it into the deck forward of Stone’s flight station. The sound of violins — a light, delicate phrase — came drifting out into the cabin’s thin air. Gershon closed his eyes, and let the music wash over him. Mozart: Symphony Number 40. Exquisite. He felt himself relax, and even the cabin around him started to feel bigger.

Nam vets were supposed to live up to the image of spaced-out Jimi Hendrix fans. And in Houston, image was an important thing: when you had ten guys, with equally good qualifications, competing for one seat, intangibles like image could win you a flight, or lose you one.

So Gershon kept his Mozart to himself.

He was alone in the cabin as he worked through his checklist. Closing the hatch was strictly against regs, and he had to clear it with Stone every time he went in there. But Apollo was one of the few places in the whole cluster where you could get a little genuine privacy. Stone understood. You had to have a little space, a little time to yourself.

It was strange to think that there were only three human beings within tens of millions of miles of this point, and yet here they were cooped up together, for months on end, in this collection of tin cans. The only solid interior partitions in the Mission Module were those around the crapper.