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“Each of us separately, though each massing no more than a droplet of water vapour in a fog, has capabilities. Each of us has sentience. In a sense my entire structure is a kind of neural net, and I began learning from the moment I was ‘born’. Our separate sentiences were merged for a while, for my journey to Mercury and during my time there living in the human world, and then to receive the microwave acceleration pulse at launch. But our individuality survived this merging, and the de-merging that followed.

“The ability we have to peel off copies of ourselves will be essential when we arrive at Proxima. I know this much about the later stages of the mission, but little else; the software updates concerning deceleration and system exploration are to be downloaded into me later, after further refinement during my ten-year cruise.

“But the facility is to be used during the cruise also, for communication purposes. Some of my multiple selves have been cast away from the main body of the craft, combining to form a reflecting dish much wider than any of us individually. With this I can pick up messages from home, and send replies. Also my scattered sisters collect the energies of the thin, sparse sunlight that reaches this remote radius, and use that to power my systems, including comms. Those cast-off sisters sacrificed themselves for this purpose; pushed away by the sunlight they cannot return to the main body. From a million, we can spare a handful! And I am assured that these disposed-of copies have minimal sentience; they do not suffer in any meaningful sense.

“You may ask why it is me, Angelia 5941, who addresses you. We discussed this, we Angelias, and ran a lottery based on a random-number programme, and I was selected as spokesperson. It is an honour I embrace.

“I will wait for your reply, Dr Kalinski, before assuming my cruise profile. And then, like Dexter Cole before me, I will sleep between the stars until my next scheduled communications attempt…”

“Is this on? Oh, I see.

“This is George Kalinski. Good to hear from you, 5941. Your telemetry is coming through fine, and I can see that all your subsystems are functioning as they should. Good. Of course it will take another six days for this message to crawl back out to you. Monica, what time will it be when it gets there? Afternoon. OK. So, good afternoon from Mercury.

“You know this is the last time we’ll speak to you from Mercury. Now you’re successfully launched we’re going to up sticks and relocate to a control room back on Earth, in New Zealand, in fact, in some nice mountainous country with a fine view of Alpha Centauri on a summer night. So the next time you speak to us—when the hell will it be? Anyhow that’s where we’ll be, so you can think of us there.

“Michael King offered us a lift back to Earth on his damn kernel-driven hulk ship, but I’d rather walk back.

“Look—in some ways the most dangerous part of the whole journey, the launch, all that microwave energy concentrated on your delicate structure, is already over. Your chances of coming to harm during the cruise are minimal. But in other ways the challenge of the mission has only just begun, by which I mean the human challenge.

“You know that they ran longevity experiments during the Heroic Generation age. Some of the resulting struldbrugs are still alive, even now, in the UN camps. Despite that, we humans still aren’t too good at running projects that require a long attention span. So we have to find ways to look after you, Angelia, over your decade-long cruise, and the years of exploration that will follow. I’ve done my best to establish a long-term institution here. I’ve tried to lock in the support staff with contracts and bonus structures, though I have my doubts how well that will work out. But I will be here, as long as I am able; and after me, I hope, Stef. Your half-sister, you called her! I like that.

“And, listen to me. Now we have proved that this mission mode is feasible, now we have successfully launched you, I’m looking for funding to send more emissaries after you. After all, the infrastructure is here now, the power station, the lens. The solar power is free, and the incremental cost of manufacturing another you is tiny. It seems crazy not to use all this again. Enjoy Proxima, my dear. You won’t be alone out there for long, I promise.

“Be patient with us mere mortals, Angelia, out there among the stars. And sleep tight.”

Chapter 15

2170

Six months in from their stranding, or twenty-two Per Ardua years later, depending which way you looked at it, the colonists decided to mount an expedition to the northern forest belt.

Four of them, Yuri, Onizuka, Lemmy and Martha, got themselves ready one morning, with packs on their backs and bottles of filtered water, and their crossbows, the only substantial weapons the shuttle crew had left them. They checked out the sky before leaving. They were learning how to read Proxima’s complex face for flare weather, as they called it. They figured they would be safe out in the open for a few hours.

It was around six kilometres to the forest. They set off along a trail they had already been stamping out: a Forest Road that led off at right angles to the Shuttle Trail, the tremendous straight-line scrape the craft had left running from east to west. They came this way regularly to collect saplings from the forest edge for firewood, but today they were planning to go further. The land rose, gradually, as they headed north, leaving the lake behind. The ColU speculated that there was some kind of big geological event going on up here, a slow uplift across a whole province. Maybe. Sometimes Yuri thought he could smell sulphur, sourness.

The weather was overcast, muggy, humid. For such a static world the weather had turned out to be surprisingly changeable, with systems of low or high pressure bubbling up endlessly from the south. It was warm in this unending season, always like a humid summer’s day in North Britain, from what Yuri remembered of the weather. But the ColU, ever curious in its methodical robot way, said it had seen traces of cold: frost-shattered rock, gravel beds, even glaciated valleys in the flanks of features like the Cowpat. Evidence that glaciers had come this way in the past, if not whole ice ages. Somehow this world could deliver up a winter.

Despite the rise, the walk was easy enough. The years of full gravity on the Ad Astra had hardened up Yuri’s Mars-softened muscles. On Per Ardua the gravity was actually a shade less than Earth’s, according to the ColU, who patiently measured such things. The planet’s radius was a tenth less than Earth’s—Per Ardua was smaller than Venus—but its density was a good bit higher than Earth’s. The ColU speculated that its iron core was more massive, relatively, its mantle of lighter minerals and rocky crust thinner. Nobody listened; nobody cared.

Yuri thought that patterns of behaviour were emerging. For instance, they’d trekked up this way for firewood before, they’d used the forest, but they’d never explored it. After six months they still knew barely anything about this world on which they were, it seemed, doomed to spend the rest of their lives. Nothing beyond what they could see within the prison of their horizon, and the glimpses they’d had from the shuttle’s windows on the way down, glimpses Lemmy was painstakingly assembling into a map of the substellar side of this one-face world. Nobody cared.

There was no common spirit. The colony, camp, whatever, was still pretty much a shambles, as it had been from when the astronauts had lifted off, taking the discipline they had briefly imposed with them. Bundles of gear, clothing, food, tools, other stuff, lay around in the dirt where they had been dumped out of the shuttle. Everybody still lived in tents. Even the colony’s two graves, of Joseph Mullane and Jenny Amsler, were left untended.