“But if the breeding stock is reduced to only seven. . then that’s all you have to work with, right?”
“Not quite. Well, technically yes, I suppose. But by manipulating some of the genes, we can create heterozygosity artificially. As well as getting rid of some of the genetic defects that would otherwise propagate through the whole population.”
“Anyway,” Doob said, “it’s obviously of interest to us now.”
“If the Cloud Ark’s as populous as they claim it’s going to be, and if people come up with frozen sperm samples and ova and embryos and all of that, then the human population is probably all right. We’ll have enough heterozygosity to make a go of it. My work here is going to be more concerned with nonhuman populations.”
“Meaning. .”
“Well, you’ve probably heard that we’ll be growing algae as a way to generate oxygen. Which is only the start of a simple ecosystem that will have to be developed and grown, and become much less simple, over the years to come. Many of the plants and microorganisms that will make up that ecosystem will be cultivated from initially small breeding populations. We don’t want to have a repeat of the Irish potato famine, or something analogous, with the plants we rely on to make it possible to breathe.”
“So your job will be to do with them what was done in the case of black-footed ferrets.”
“Part of my job, yes.”
“What’s the other part?”
“Being a sort of Victorian museum curator. Did you ever visit Clarence’s home in Cambridge?”
“No, I’m sorry to say. But I heard his collection was magnificent.”
“It was crammed with all of these stuffed birds and boxed beetles and mounted heads of beasts, gathered by Victorian gentleman-collector types in pith helmets, doing their bit for science on the fringes of the empire. Not scientists as we’d define them today but contributors to the scientific ideal. These things overflowed the museums and Clarence acquired them by the lorry-load, especially after Edwina died and couldn’t forbid it. Anyway, I’m that person now, except that the samples are all digital, and they are all on these things.” She tapped a thumb drive that was floating around her neck on a chain. “Or their rad-hard equivalents.” She pronounced the technical term with a dubious and ironic tone of voice, suggesting that she and the International Space Station would take a while getting used to each other. “You know the general story — I’ve heard you talking about it on YouTube.” She switched into a credible imitation of Doob’s flat midwestern vowels: “‘We can’t send blue whales and sequoias up on the Cloud Ark. And even if we could, we couldn’t keep them alive there. But we can send their DNA, encoded as strings of ones and zeroes.’”
“You’re going to put me out of a job,” Doob said.
“Good. Then I’ll put you to work here,” Moira said. “This is labor intensive as hell, and they’re not sending me enough help.”
“I thought it was all automatic.”
“If the Agent had given us another couple of decades to improve our gene synthesis technology, it might have become so,” Moira said. “As it is, we’ve been caught in a bit of a gawky adolescent phase. Yes, we can take one of these files”—she tapped the thumb drive around her neck—“and we can create a strand of DNA from it, beginning with a few simple precursor chemicals. But the amount of human intervention is still ridiculous.”
“I’m guessing that is some pretty high-level human intervention too.”
“My Jamaican grandfather worked in the engine room of a navy ship,” Moira said, “which is how our family ended up in England. When I was a little girl, he took me on a tour of one of those ships, and we went down into the engine room, and I saw it, the engine, with all of the bits exposed; the bloody thing was naked and men had to go crawling around on it with oil cans, lubricating the bearings by hand and so on. That’s a bit like where we are now with synthesizing whole genomes.”
“But for now,” Doob said, “that’s far in the future, right?”
“Yes, thank God.”
“For now you’re going to be tinkering with intact organisms.”
“Yes. Just so. Still quite difficult, but I think manageable.” She looked around. The module in which they floated looked nothing like a lab. Everything was sealed up in plastic or aluminum cases, taped shut and labeled with yellow sticky notes. “Sorry,” she said. “Underwhelming. Hardly worth the trip, is it?”
“How can I help?”
“Get me some fucking gravity,” Moira said. Then she laughed. “Can you imagine trying to do tricks with liquids in zero gee? Because that’s all a lab is.”
“It must look frustrating to you now,” Doob said. “Everything in boxes, no gravity to make it all work.”
“I know, I know,” she said. “I’m whingeing. They’ll put this thing on a bolo, won’t they?”
“Maybe a third torus. Big enough to make something close to Earth-normal gravity. Lots of space to work in. A staff of eager Arkers.”
“That’s your job now, isn’t it?” Moira said. “Cheerleader for the Ark.”
“It was my ticket up here,” Doob said. He could feel a little warmth creeping into his face, and cautioned himself not to say anything he was going to regret. “We all needed that ticket. Now that we have paid the price of admission, we need to make it work.”
Moira, perhaps sensing she’d gone a little too far, kept her silence and would not meet his gaze.
“And as of today,” he said, “we have one year.”
Part Two
DAY 700
ON DAY 700, ALSO KNOWN AS A+1.335 (ONE YEAR AND 335 DAYS SINCE the destruction of the moon), the Cloud Ark, as seen from the Earth, looked like a bright bead strung on a silver chain. For the reasons that Dr. Dubois Jerome Xavier Harris had tried to articulate during his soliloquy aboard Arklet 2, back on A+1.0, it was expensive, in terms of propellant, to maintain an actual cloud or swarm of arklets around Izzy. Much cheaper and more reliable was to have them precede or follow the space station along the same orbital path, like a queue of ducklings with Mom in the middle. Once an arklet had found its place in that train, changing its position was a maneuver whose complications were a perennial source of surprise and consternation to newly arrived members of the so-called General Population.
Arkies as such — people who had been selected in the Casting of Lots, who had spent up to two years in training for this mission, and who had been sent up here specifically to manage, and live in, arklets — understood it implicitly. As of Day 700, there were 1,276 of those, with about two dozen more coming up each day during the final surge of launches. New arrivals were assigned to empty arklets that awaited them at the head or the tail of the queue. These were launched on separate heavy-lift rockets about four times a day. Since an arklet consisted mostly of empty space, it weighed almost nothing compared to the lift capacity of a big rocket, and so they were always crammed from boiler room to front door with vitamins. These had to be extracted and stowed before the arklet could be occupied. Each arklet had its own unique manifest of stuff. Some of them were just full of compressed gas, such as nitrogen, which would later be used to fertilize crops. Others might be packed with enough diverse and seemingly random goods to open a space bazaar: medicines, cultural artifacts, micronutrients, tools, integrated circuits, spare parts for Stirling engines, Arkies’ personal effects, and, in one notable case, a stowaway who was found dead on arrival. With the exception of the stowaway — who was stashed in the morgue with the rest of the deceased — all of these items had to be extracted, cataloged, and stowed appropriately. Each arklet had some onboard storage space, so to some extent the storage was distributed — that being a fundamental tenet of the whole swarm-based Arkitecture. Bulk materials like gases could be pumped into external tanks or bladders: little ones dangling from arklets, big ones distributed around Izzy’s periphery where they could serve as extra shielding against radiation and micrometeoroids. So-called dry goods were likewise stashed in mesh bags that lived “outside” until such time as they were needed. Scarce and crowded “inside” space was reserved for organisms and goods that actually needed air and warmth. So, compared to the way it had looked a year ago, Izzy was spare and clean on the inside.