OLD EARTH STORIES.

Stephen Baxter.

Here are included eight previously uncollected short stories of the XeeLee Universe. The first, 'Return to t.i.tan' (AD 3685) is from the Expansion ERA; the second, 'Remembrance' (AD 5071) is from the ERA of Squeem Occupation; the third, 'The Seer and the Silverman' (AD 5810) is from the War with the Ghosts ERA.The last five stories are from the Old Earth ERA, 4 billion years into the future.

RETURN TO t.i.tAN.

PROLOGUE.

Probe

The s.p.a.cecraft from Earth sailed through rings of ice.

In its first week in orbit around Saturn it pa.s.sed within a third of a million kilometers of t.i.tan, Saturn's largest moon. Its sensors peered curiously down at unbroken haze.

The craft had been too heavy to launch direct with the technology of the time, so its flight path, extending across seven years, had taken it on swingbys past Venus, Earth, and Jupiter. Primitive it was, but it was prepared for t.i.tan. An independent lander, a fat pie-dish shape three meters across, clung to the side of the main body. Dormant for most of the interplanetary cruise, the probe was at last woken and released.

And, two weeks later, it dropped into the thick atmosphere of t.i.tan itself.

Much of the probe's interplanetary velocity was shed in ferocious heat, and the main parachute was released. Portals opened and booms unfolded, and more than a billion kilometers from the nearest human engineer, instruments peered out at t.i.tan. Some 50 kilometers up the surface slowly became visible. This first tantalizing glimpse was like a high-alt.i.tude view of Earth, though rendered in somber reds and browns.

The landing in gritty water-ice sand was slow, at less than 20 kilometers per hour.

After a journey of so many years the surface mission lasted mere minutes before the probe's internal batteries were exhausted, and the chatter of telemetry fell silent. It would take two more hours for news of the adventure to crawl at lightspeed to Earth, by which time a thin organic rain was already settling on the probe's upper casing, as the last of its internal heat leaked away.

And then, all unknown to the probe's human controlers back on Earth, a manipulator not unlike a lobster's claw closed around Huygens's around Huygens's pie-dish hull and dragged the crushed probe down beneath the water-ice sand. pie-dish hull and dragged the crushed probe down beneath the water-ice sand.

I Earthport

"There's always been something wrong with t.i.tan." These were the first words I ever heard Harry Poole speak-though I didn't know the man at the time-words that cut through my hangover like a drill. "It's been obvious since the first primitive probes got there 1600 years ago." He had the voice of an older man, 70, 80 maybe, a scratchy texture. "A moon with a blanket of air, a moon that cradles a whole menagerie of life under its thick atmosphere. But that atmosphere's not sustainable."

"Well, the mechanism is clear enough. Heating effects from the methane component keep the air from cooling and freezing out." This was another man's voice, gravely, a bit somber, the voice of a man who took himself too seriously. The voice sounded familiar. "Sunlight drives methane reactions that dump complex hydrocarbons in the stratosphere "

"But, son, where does the methane come from?" Harry Poole pressed. "It's destroyed by the very reactions that manufacture all those stratospheric hydrocarbons. Should all be gone in a few million years, ten million tops. So what replenishes it?"

At that moment I could not have cared less about the problem of methane on Saturn's largest moon, even though, I suppose, it was a central facet of my career. The fog in my head, thicker than t.i.tan's tholin haze, was lifting slowly, and I became aware of my body, aching in unfamiliar ways, stretched out on some kind of couch.

"Maybe some geological process." This was a woman's voice, a bit brisk. "That or an ecology, a Gaia process that keeps the methane levels up. Those are the obvious options."

"Surely, Miriam," Harry Poole said. "One or the other. That's been obvious since the methane on t.i.tan was first spotted from Earth. But n.o.body knows. knows. Oh, there have been a handful of probes over the centuries, but n.o.body's taken t.i.tan seriously enough to nail it down. Always too many other easy targets for exploration and colonization-Mars, the ice moons. n.o.body's even walked on t.i.tan!" Oh, there have been a handful of probes over the centuries, but n.o.body's taken t.i.tan seriously enough to nail it down. Always too many other easy targets for exploration and colonization-Mars, the ice moons. n.o.body's even walked on t.i.tan!"

Another man, a third, said, "But the practical problems the heat loss in that cold air-it was always too expensive to bother, Harry. And too risky..."

"No. n.o.body had the vision to see the potential of the place. That's the real problem. And now we're hamstrung by these d.a.m.n sentience laws."

"And you think we need to know." That gravel voice.

"We need t.i.tan, son," Harry Poole said. "It's the only hope I see of making our wormhole link pay for itself. t.i.tan is, ought to be, the key to opening up Saturn and the whole outer System. We need to prove the sentience laws don't apply there, and move in and start opening it up. That's what this is all about."

The woman spoke again. "And you think this wretched creature is the key."

"Given he's a sentience curator, and a crooked one at that, yes..."

When words like "wretched" or "crooked" are bandied about in my company it's generally Jovik Emry that's being discussed. I took this as a cue to open my eyes. Some kind of gla.s.sy dome stretched over my head, and beyond that a slice of sky-blue. I recognized the Earth seen from s.p.a.ce. And there was something else, a sculpture of electric blue thread that drifted over a rumpled cloud layer.

"Oh, look," said the woman. "It's alive."

I stretched, swivelled and sat up. I was stiff and sore, and had a peculiar ache at the back of my neck, just beneath my skull. I looked around at my captors. There were four of them, three men and a woman, all watching me with expressions of amused contempt. Well, it wasn't the first time I'd woken with a steaming hangover in an unknown place surrounded by strangers. I would recover quickly. I was as young and healthy as I could afford to be: I was around 40, but AS-preserved at my peak of 23.

We sat on couches at the center of a cluttered circular deck, domed over by a scuffed carapace. I was in a GUTship, then, a standard interplanetary transport, if an elderly one; I had traveled in such vessels many times, to Saturn and back. Through the clear dome I could see more of those electric-blue frames drifting before the face of the Earth. They were tetrahedral, and their faces were briefly visible, like soap films that glistened gold before disappearing. These were the mouths of wormholes, flaws in s.p.a.cetime, and the golden shivers were glimpses of other worlds.

I knew where I was. "This is Earthport." My throat was dry as moondust, but I tried to speak confidently.

"Well, you're right about that." This was the man who had led the conversation earlier. That 70-year-old voice, comically, came out of the face of a boy of maybe 25, with blond hair, blue eyes, a smooth AntiSenescence marvel. The other two men looked around 60, but with AS so prevalent it was hard to tell. The woman was tall, her hair cut short, and she wore a functional jumpsuit; she might have been 45. The old-young man spoke again. "My name is Harry Poole. Welcome to the Hermit Crab Crab, which is my son's ship "

"Welcome? You've drugged me and brought me here "

One of the 60-year-olds laughed, the gruff one. "Oh, you didn't need drugging; you did that to yourself."

"You evidently know me and I think I know you." I studied him. He was heavy set, dark, not tall, with a face that wasn't built for smiling. "You're Michael Poole, aren't you? Poole the wormhole engineer."

Poole just looked back at me. Then he turned to the blond man. "Harry, I have a feeling we're making a huge mistake trying to work with this guy."

Harry grinned, studying me. "Give it time, son. You've always been an idealist. You're not used to working with people like this. I am. We'll get what we want out of him."

I turned to him. "Harry Poole. You're Michael's father, aren't you?" I laughed at them. "A father who AS-restores himself to an age younger than your son. How cra.s.s. And, Harry, you really ought to get something done about that voice."

The third man spoke. "I agree with Michael, Harry. We can't work with this clown." He was on the point of being overweight, and had a crumpled, careworn face. I labeled him as a corporate man who had grown old laboring to make somebody else rich probably Michael Poole and his father.

I smiled easily, unfazed. "And you are?"

"Bill Dzik. And I'll be working with you if we go through with this planned jaunt to t.i.tan. Can't say it's an idea I like."

This was the first I had heard of a trip to t.i.tan. Well, whatever they wanted of me, I had had quite enough of the dismal h.e.l.l-hole of the Saturn system, and had no intention of going back now. I had been in worse predicaments before; it was just a question of playing for time and looking for openings. I rubbed my temples. "Bill-can I call you Bill? I don't suppose you could fetch me a coffee."

"Don't push your luck," he growled.

"Just tell me why you kidnapped me."

"That's simple," Harry said. "We want you to take us down to t.i.tan."

Harry snapped his fingers, and a Virtual image coalesced before us, a bruised orange spinning in the dark: t.i.tan. Saturn itself was a pale yellow crescent with those tremendous rings spanning s.p.a.ce, and moons hanging like lanterns. And there, glimmering in orbit just above the plane of the rings, was a baby-blue tetrahedral frame, the mouth of Michael Poole's wormhole, a hyper-dimensional road offering access to Saturn and all its wonders a road, it seemed, rarely traveled.

"That would be illegal," I pointed out.

"I know. And that's why we need you." And he grinned, a cold expression on that absurdly young face.

II Finance

"If it's an expert on t.i.tan you want," I said, "keep looking."

"You're a curator," Miriam said, disbelief and disgust thick in her voice. "You work for the intraSystem oversight panel on sentience law compliance. t.i.tan is in your charge!"

"Not by choice," I murmured. "Look-as you evidently targeted me, you must know something of my background. I haven't had an easy career..." My life at school, supported by my family's money, had been a series of drunken jaunts, s.e.xual escapades, petty thieving, and vandalism. As a young man I never lasted long at any of the jobs my family found for me, largely because I was usually on the run from some wronged party or other.

Harry said, "In the end you got yourself sentenced to an editing, didn't you?"

If the authorities had had their way I would have had the contents of my much-abused brain downloaded into an external store, my memories edited, my unhealthy impulses "re-programmed", and the lot loaded back again my whole self rebooted. "It represented death to me," I said. "I wouldn't have been the same man as I was before. My father took pity on me "

"And bought you out of your sentence," Bill Dzik said. "And got you a job on sentience compliance. A sinecure."

I looked at t.i.tan's dismal colors. "It is a miserable posting. But it pays a bit, and n.o.body cares much what you get up to, within reason. I've only been out a few times to Saturn itself, and the orbit of t.i.tan; the work's mostly admin, run from Earth. I've held down the job. Well, I really don't have much choice."

Michael Poole studied me as if I were a vermin infesting one of his marvelous interplanetary installations. "This is the problem I've got with agencies like the sentience-oversight curacy. I might even agree with its goals. But it's populated by time-wasters like you, it doesn't do what it's supposed to achieve, and all it does is get in the way of enterprise."

I found myself taking a profound dislike to the man. And I've never been able to stomach being preached at. "I did n.o.body any harm," I snapped back at him. "Not much, anyhow. Not like you with your grand schemes, Poole, reordering the whole System for your own profit."

Michael would have responded, but Harry held up his hand. "Let's not get into that. And after all he's right. Profit, or the lack of it, is the issue here. As for you, Jovik, even in this billion-kilometers-remote "sinecure" you're still up to your old tricks, aren't you?"

I said nothing, cautious until I worked out how much he knew.

Harry waved his hand at his Virtual projection. "Look t.i.tan is infested with life. That's the basic conclusion of the gaggle of probes that, over the centuries, have orbited t.i.tan or penetrated its thick air and crawled over its surface or dug into its icy sand. But life isn't the point. The whole System whole System is full of life-life that blows everywhere, in impact-detached rocks and lumps of ice. Life is commonplace. The question is sentience. And sentience holds up progress." is full of life-life that blows everywhere, in impact-detached rocks and lumps of ice. Life is commonplace. The question is sentience. And sentience holds up progress."

"It's happened to us before," Michael Poole said to me. "The development consortium I lead, that is. We were establishing a wormhole Interface at a Kuiper object called Baked Alaska, out on the rim of the System. Our purpose was to use the ice as reaction ma.s.s to fuel GUTdrive starships. Well, we discovered life there, life of a sort, and it wasn't long before we identified sentience. The xen.o.biologists called it a Forest of Ancestors. The project ground to a halt; we had to evacuate the place "

"Given the circ.u.mstances in which you've brought me here," I said, "I'm not even going to feign interest in your war stories."

"All right," Harry said. "But you can see the issue with t.i.tan. Look, we want to open it up for development. It's a factory of hydrocarbons and organics, and exotic life forms some of which at least are related to our own. We can make breathable air from the nitrogen atmosphere and oxygen extracted from water ice. We can use all that methane and organic chemistry to make plastics or fuel or even food. t.i.tan should be the launch pad for the opening-up of the outer System, indeed the stars. But we're not going to be allowed to develop t.i.tan if there's sentience there. And our problem is that n.o.body has established that there isn't."

I started to see it. "So you want to mount a quick and dirty expedition, violating the planetary-protection aspects of the sentience laws, prove there's no significant mind down there, and get the clearance to move in the digging machines. Right?" And I saw how Bill Dzik, Miriam, and Michael Poole exchanged unhappy glances. There was dissension in the team over the morality of all this, a crack I might be able to exploit. "Why do you need this so badly?" I asked.

So they told me. It was a saga of interplanetary ambition. But at the root of it, as is always the case, was money-or the lack of it.

III Negotiation

Harry Poole said, "You know our business, Jovik. Our worm-hole engineering is laying down rapid-transit routes through the System, which will open up a whole family of worlds to colonization and development. But we have grander ambitions than that."

I asked, "What ambitions? Starships?"

"That and more," Michael Poole said. "For the last few decades we've been working on an experimental ship being built in the orbit of Jupiter..."

And he told me about his precious Cauchy. precious Cauchy. By dragging a wormhole portal around a circuit light-years across, the GUTship By dragging a wormhole portal around a circuit light-years across, the GUTship Cauchy Cauchy would establish a wormhole bridge-not across s.p.a.ce-but across fifteen centuries, to the future. So, having already connected the worlds of humanity with his wormhole subway System, Michael Poole now hoped to short-circuit past and future themselves. I looked at him with new respect, and some fear. The man was a genius, or mad. would establish a wormhole bridge-not across s.p.a.ce-but across fifteen centuries, to the future. So, having already connected the worlds of humanity with his wormhole subway System, Michael Poole now hoped to short-circuit past and future themselves. I looked at him with new respect, and some fear. The man was a genius, or mad.

"But," I said, "to fund such dreams you need money."

Harry said, "Jovik, you need to understand that a mega-engineering business like ours is a ferocious devourer of cash. It's been this way since the days of the pioneering railway builders back in the nineteenth century. We fund each new project with the profit of our previous ventures and with fresh investment but that investment is closely related to the success of the earlier schemes."

"Ah. And you're stumbling. Yes? And this is all to do with Saturn."

Harry sighed. "The Saturn transit was a logical development. The trouble is, n.o.body needs to go there. Saturn pales beside Jupiter! Saturn has ice moons; well, there are plenty in orbit around Jupiter. Saturn's atmosphere could be mined, but so can Jupiter's, at half the distance from Earth."

Miriam said, "Saturn also lacks Jupiter's ferociously energetic external environment, which we're tapping ourselves in the manufacture of the Cauchy."

"Fascinating," I lied. "You're an engineer too, then?"

"A physicist," she replied, awkward. She sat next to Michael Poole but apart from him. I wondered if there was anything deeper between them.

"The point," said Harry, "is that there's nothing at Saturn you'd want to go there for no reason for our expensive wormhole link to be used. Nothing except "

"t.i.tan," I said.

"If we can't get down there legally, we need somebody to break us through the security protocols and get us down there."

"So you turned to me."

"The last resort," said Bill Dzik with disgust in his voice.

"We tried your colleagues," Miriam said. "They all said no."

"Well, that's typical of that bunch of prigs."

Harry, always a diplomat, smiled at me. "So we're having to bend a few pettifogging rules, but you have to see the vision, man, you have to see the greater good. And it's a chance for you to return to t.i.tan, Jovik. Think of it as an opportunity."

"The question is, what's in it for me? You know I've come close to the editing suites before. Why should I take the risk of helping you now?"

"Because," Harry said, "if you don't you'll certainly you'll certainly face a reboot." So now we came to the dirty stuff. Harry took over; he was clearly the key operator in this little cabal, with the other engineer types uncomfortably out of their depth. "We know about your sideline." face a reboot." So now we came to the dirty stuff. Harry took over; he was clearly the key operator in this little cabal, with the other engineer types uncomfortably out of their depth. "We know about your sideline."