Most of Arkady’s problem runs ended in failure, however, meaning death for all. Simulated or not, it was hard not to be sobered by these experiences, and after that, irritated with Arkady for inventing them. One time they repaired every monitor in the bridge just in time to see the screens register a hit by a small asteroid, which sheared through the hub and killed them all. Another time Arkady, as part of the navigation team, made an “error” and instructed the computers to increase the ship’s spin rather than decrease it. “Pinned to the floor by six gs!” he cried in mock horror, and they had to crawl on the floor for half an hour, pretending to rectify the error while weighing half a ton each. When they succeeded, Arkady leaped off the floor and began pushing them away from the control monitor. “What the hell are you doing?” Maya yelled.

“He’s gone crazy,” Janet said.

“He’s simulated going crazy,” Nadia corrected her. “We have to figure out,” doing an end run around Arkady, “how to deal with someone on the bridge going insane!”

Which no doubt was true. But they could see the whites of Arkady’s eyes all the way around, and there wasn’t a trace of recognition in him as he silently assaulted them; it took all five of them to restrain him, and Janet and Phyllis Boyle were hurt by his sharp elbows.

“Well?” he said at dinner afterward, grinning lopsidedly, as he was growing a fat lip. “What if it happens? We’re under pressure up here, and the approach will be worst of all. What if someone cracks?” He turned to Russell and the grin grew wider. “What are the chances of that, eh?” And he began to sing a Jamaican song, in a Slavic Carribean accent: “‘Pressure drop, oh pressure drop, oh-o, pressure going to drop on you-oo-oo!’”

So they kept trying, handling the problem runs as seriously as they could, even the attack by Martian natives or the decoupling of Torus H caused by “explosive bolts installed by mistake when the ship was built,” or the last minute veering of Phobos out of its orbit. Dealing with the more implausible scenarios sometimes took on a kind of surreal black humor, and Arkady replayed some of his videotapes as after-dinner entertainment, which sometimes got people launched into the air with laughter.

But the plausible problem runs… They kept on coming, morning after morning. And despite the solutions, despite the protocols for finding solutions, there was that sight, time after time: the red planet rushing at them at an unimaginable forty thousand kilometers an hour, until it filled the screen and the screen went white, and small black letters appeared on it: Collision.

They were traveling to Mars in a Type II Hohmann Ellipse, a slow but efficient course, chosen from among other alternatives mainly because the two planets were in the correct position for it when the ship was finally ready, with Mars about forty-five degrees ahead of Earth in the plane of the ecliptic. During the voyage they would travel just over halfway around the Sun, making their rendezvous with Mars some three hundred days later. Their womb time, as Hiroko called it.

The psychologists back home had judged it worthwhile to alter things from time to time, to suggest the passing of the seasons on the Ares. Length of days and nights, weather, and ambient colors were shifted to accomplish this. Some had maintained their landfall should be a harvest, others that it should be a new spring; after a short debate it had been decided by vote of the voyagers themselves to begin with spring, so that they would travel through a summer rather than a winter; and as they approached their goal, the ship’s colors would turn to the autumn tones of Mars itself, rather than to the light greens and blossom pastels they had left so far behind.

So in those first months, as they finished their morning’s business, leaving the farm or the bridge, or staggering out of Arkady’s merrily sadistic simulations, they walked into springtime. Walls were hung with pale green panels, or mural-sized photos of azaleas, and jacarandas, and ornamental cherries. The barley and mustard in the big farm rooms glowed vivid yellow with new blooms, and the forest biome and the ship’s seven park rooms had been stocked with trees and shrubs in the spring of their cycles. Maya loved these colorful spring blossoms, and after her mornings’ work she fulfilled part of her exercise regimen by taking a walk in the forest biome, which had a hilly floor, and was so thick with trees one could not see from one end of the chamber to the other. Here she often met Frank Chalmers, of all people, taking one of his short breaks. He said he liked the spring foliage, though he never seemed to look at it. They walked together, and talked or not as the case might be. If they did talk, it was never about anything important; Frank didn’t care to discuss their work as leaders of the expedition. Maya found this peculiar, though she didn’t say so. But they did not have exactly the same jobs, which might account for his reluctance. Maya’s position was fairly informal and non-hierarchical; cosmonauts among themselves had always been relatively egalitarian, this had been the tradition since the days of Korolyov. The American program had a more military tradition, indicated even in titles: while Maya was merely Russian Contingent Co-ordinator, Frank was Captain Chalmers, and supposedly in the strong sense of the old sailing navies.

Whether this authority made it more or less difficult for him, he didn’t say. Sometimes he discussed the biome, or small technical problems, or news from home; more often he just seemed to want to walk with her. So-silent walks, up and down on narrow trails, through dense thickets of pine and aspen and birch. And always that presumption of closeness, as if they were old friends, or as if he were, very shyly (or subtly), courting her.

Thinking about that one day, it occurred to Maya that starting the Ares in springtime might have created a problem. Here they were in their mesocosm, sailing through spring, and everything was fertile and blooming, profligate and green, the air perfumed with flowers and windy, the days getting longer and warmer, and everyone in shirts and shorts, a hundred healthy animals, in close quarters, eating, exercising, showering, sleeping. Of course there had to be sex.

Well, it was nothing new. Maya herself had had some fantastic sex in space, most significantly during her second stint on Novy Mir, when she and Georgi and Yeli and Irina had tried every weightless variant imaginable, which was a great many indeed. But now it was different. They were older, they were stuck with each other for good: “ Everythingis different in a closed system,” as Hiroko often said in other contexts. The idea that they should stay on a fraternal basis was big at NASA: out of the 1,348 pages of the tome NASA had compiled called Human Relations In Transit To Mars, only a single page was devoted to the subject of sex; and that page advised against it. They were, the tome suggested, something like a tribe, with a sensible taboo against intertribal mating. The Russians laughed hilariously at this. Americans were such prudes, really. “We are not a tribe,” Arkady said. “We are the world. ”

And it was spring. And there were the married couples aboard, some of whom were pretty demonstrative; and there was the swimming pool in Torus E, and the sauna and whirlpool bath. Bathing suits were used in mixed company, this because of the Americans again, but bathing suits were nothing. Naturally it began to happen. She heard from Nadia and Ivana that the bubble dome was being used for assignations, in the quiet hours of the night; many of the cosmonauts and astronauts turned out to be fond of weightlessness. And the many nooks in the parks and the forest biome were serving as hideaways for those with less weightless experience; the parks had been designed to give people the sense that they could get away. And every person had a private soundproofed room of their own. With all that, if a couple wanted to begin a relationship without becoming an item in the gossip mill, it was possible to be very discreet. Maya was sure there was more going on than any one person could know.