William Barton.

DOWN IN THE DARK.

Yesterday, August 4, 2057, was my fifty-third birthday. I don't think anyone noticed. No one said anything. Maybe birthdays don't count anymore.

I sat in the half-track's c.o.c.kpit, wearing my pressure suit, gloves off, helmet thrown back, steering by memory, as if caught in a dream. Four months. Four more months and I would've gone home, home to Lisa, whose letters said she was still waiting for me after all these years. But then the world came to an end, and all that ended along with it.

Sometimes, when I'm asleep, I still see the ending itself, see the newsreels transmitted after the fact from Moonbase. Just a nickel-iron asteroid twenty-three kilometers across, that's all. Knew about it for more than a year, they said, keeping it secret so there'd be no panic, making their plans in secret, carrying them off the same way.

Big rock like that, you'd think they'd've known about it for decades, but that long elliptical orbit, taking it out past Neptune... no number. No name on it but ours.

See those six bright flashes? Six thirty-year-old thermonuclear bombs going off, blowing the d.a.m.ned thing to bits. Now see the pretty pieces? Notice how they entrain and continue on their way? Twelve of them hit the Earth, one right after another, during the course of a long and interesting day.

I imagined people, imagined my old friends, seeing those secret nuclear flashes in the deep night sky, going, What the h.e.l.l... ?

The biggest one hit the South Pole, coming in almost level, and d.a.m.n if you couldn't see the West Antarctic ice sheet lift right off, breaking to a trillion glittery bits as it flew into orbit.

The last one came down dead square in the middle of North America, not far from Kansas City. Not far from my house. I kept imagining, hoping anyway, that Lisa was asleep just then. But she was probably out in the backyard with all our old friends, maybe watching with my binoculars as...

I had the cabin lights off, surrounded by the dull red glow of a few necessary dials, the bluer glow of a half dozen small plasma screens, so I could see outside, watch bits of landscape jump into the headlights' wash, low hummocks of waxy ice, pinkish snow the color of the stuff that sometimes grows down in the bowl of a dirty toilet.

Following old ruts outside, my own tracks, driven over and over again.

The saddleback came up, ground leveling out, forming a very shallow caldera. I pulled over to my familiar place, pink snow mashed flat, glazed yellow from environmental heating, parked where I'd parked a hundred times already, killed the headlights, dimmed the panel lights as much as they'd go without full powerdown, waited for my eyes to catch up.

The world came out of its own background gloom, like a ghost ship coasting from a fog, landscape tumbling down away from me, dull purplish hills and blue half-mountains, rolling away in the mist like the Adirondacks in springtime, rolling all the way to the sh.o.r.es of the Waxsea. More mist out there, then pale, gla.s.sy red nothing disappearing long before it got to where the horizon should've been.

From the heights of the Aerhurst Range, pressure ridge complex puckering the midline of Terra Noursae, maybe seven klicks from where Huygens set down, just a few weeks before I was born, you get one of the best views in the solar system. Maybe why I stop for it every time.

Overhead, the sky was bright now, though it was near the middle of an eight-day night. Maybe my eyes are learning to adapt quicker, quicker with each pa.s.sing day. Maybe I'm at home here now.

Sure as h.e.l.l can't be home anywhere else.

Everyone says the sky is orange here, even more orange than the sky on Venus, but it isn't. h.e.l.l, I've been to Venus. I know what that sky looks like. Not at all the same.

Sometimes, I try to imagine what the sky must look like from my old backyard. Sometimes, I imagine it just the way it was when I last saw it, not so many years ago. Other times I get a quick image of all those meters of ejecta that must be... well. Those times I let it go.

From overhead, Earth's sky looks dull gray-brown, lit up here and there, day and night, by a tawny red-orange glow. Moonbase newsreels say there's no free oxygen down there anymore, so the glow must be lava. Something like that.

Far above, hundreds of meters up, a flat snowdrift sailed along, potato chip waxflakes tumbling end over end in slow motion, twinkling, shiny, bouncing off each other, drift keeping its shape the way a terrestrial cloud keeps its shape in the wind. I clutched the Stirlings and brought the rpms as far down as the safeties would let me. Cut the cabin blower and listened to what the hull mikes were hearing.

There.

First, the dry-as-dust creaking of the landscape, stretching gently to and fro under Saturn's tidal strain. Then the dull, faraway moan of the wind. Not like an Earthly wind, wind blowing around the eaves of your house, groaning like a ghost through the branches of dead trees. Deeper here, almost subsonic, a wind that'd never been alive.

Finally... like dry, dead leaves, fallen leaves blowing along the gutter on a cold, gray fall morning, the sound of snow, drifting through the sky.

Saturn was barely visible behind the haze, nearly full, like a huge, featureless yellow moon, striated and edgeless. When it's daytime up here, if you know how to look, you can see the rings from their backscatter, like diamonds in the sky, arcing round the sooty smudge of Saturn's nightside shadow. Not now. Just that yellow disk, sitting up there, looking like an eyeless face.

I was out on Phoebe just once, fixing broken hardware. One-fifty degrees inclination to the ecliptic. Christ. It was a h.e.l.l of sight, even from thirteen million klicks out. Maybe, someday...

Running late. I powered up the halftrack's systems and got going. With the headlights on, t.i.tan was just a murky moonscape under a vaguely orange indigo sky.

Down by the Waxsea, down where the atmospheric pressure can hit two thousand millibars, the sky is opaque, Sun, Saturn, stars, and pale, iridescent blue Rhea, all lost. It's not really orange, even here. Brown might be a better word.

I pulled out of a gray defile that'd grown narrower since the last time I'd been here, engaging the pillow tires manually to break through a little ridge of waxy snow, methane and ethane not really frozen, but caught up in a sticky mess of organic polymers, pulled around a smoky pool of colorless liquid nitrogen that'd be gone in days.

Ahead of me, on a sloping surface that'd long ago lost its volatile regolith components, Workpoint 31 was looking older than before, the dome habitat baggy in places, bubble airlock drooping a bit. The weather station looked fine though, antennae sticking up just the way I remembered, anemometer turning slowly. I pulled up to the power transformer, extending my electrical probe, docking and parking in one smooth move, cutting the engines, lights, everything that could be cut.

There was a s.p.a.cesuited figure standing beside a snowmobile with the battery compartment yawning open, motionless, turned toward me. Looking closely, I could see a pale face, barely visible. No radio hail or anything. Fine by me. I got the rest of my suit on, closed myself into the half-track's too-small airlock, and thumbed the depress valve actuator. There was a soft woof as the air went out through the burner, igniting, flaring away with a brief blue flash that lit up the lock's teacup-sized porthole.

It seemed dark outside as I walked toward the snowmobile, the sky not quite... lowering. Haze coming down and... a silver golfball seemed to materialize out of the air, drifting down a shallow glidepath, coming between me and the waiting figure. The workpoint's structures were reflected upside-down in its surface.

Slow. Slow. Almost as if it were decelerating as it approached the ground. Maybe so. The air gets thicker fast down here. It hit the ground and exploded into a brief crater-shape, complete with central peak.

Ploink.

There was a quick, rippling mirror on the snow, then nothing.

The radio voice, a soft woman's voice, said, "Starting to rain. We'd better get inside."

As we struggled out of our suits, the habitat seemed incredibly cluttered. People had been bringing junk here and leaving it for years. Just leaving it. I don't know. Maybe, someday, it would've been thrown out. Now? No.

The inner surface of the pressure envelope, arching blue plastic overhead, was lumping here and there, slowly, more raindrops coming down. In just a little while, if the intensity of the storm increased, it would look like slick blue pudding, gently aboil.

The woman, who was dumpy, androgynous in her longjohns, but had a pretty oval face, dark green eyes, short, straight, straw-colored hair, held out her hand. "Christie Meitner."

I took the hand, feeling the small warmth of her fingers briefly in mine. "Hoxha Maxwell." Funny, there's less than a hundred people on t.i.tan. You'd think after four years I'd know them all.

She said, "Hoe-jah?" Not smiling, just curious. Something nervous about her, too. Like she was afraid of me or something.

I spelled it for her. "Named after some two-bit Albanian dictator by socialist parents who thought Marxism might get back on its feet someday." 2004? Getting to be a long time ago, these days. I smiled, and said, "Rubbish bin of history, and all that."

She looked away for a moment, then gestured toward the habitat's kitchen module, much of it buried under piles of unrecognizable hardware. "I was about to have dinner. You, ah... afterward, if the rain's let up, I guess we could go down to the instrument platform and get started."

Rain never lasts long here. I shook my head. "I've been going almost thirty hours straight. If I don't get some sleep, I'll break everything I touch."

Looking at me, she seemed to swallow. "Don't you, ah, sleep in the 'track?"

"Batteries won't charge if the systems don't stay powered down for at least six hours." You know that. What's the problem here?

There was something like despair in her eyes.

Asleep, she breathed with her mouth hanging open, making a hollow sound that wasn't quite a snore. Slow, soft inhale. Long pause. Quicker exhale, louder, almost like a word.

She'd put me in her bunk, the habitat's only bunk, had then curled up on the floor, snuggled in a spare bunkliner somebody'd left behind, who knows when. The liner on the bunk was her own, permeated with her scent. Nothing perfumy about it, nothing feminine. Just a people smell.

I felt like my eyes were ready to fall out, but I was too exhausted to sleep, too exhausted to do anything but lie there, looking down at her, lit by dim instrument light. When she'd put out the habitat lights, it'd seemed pitch dark, but after a while, this blue glow, that red one, a little green over there...

Almost like daylight to me now.

Abruptly, I remembered a night when I'd watched Lisa sleeping naked beside me, streaming gold hair splayed out on the sheets, head thrown back to show the long, soft curve of her neck, mulberry-bright eyes closed, moving back and forth beneath paper-thin lids.

Dreaming.

What were you dreaming, back then, back when we were so young?

I forgot to ask.

Now I'll never know.

Nights like these, I wish I'd never gone to s.p.a.ce. But s.p.a.ce was the only way an engineering technician could get rich, move us to a lifestyle where we could have that family.

"A million dollars a year," I'd argued, trying to break through her tears. "A million dollars!"

How long?

It's a twelve year contract, Lisa. Think. Think what it'll be like to have twelve million dollars... And I won't be gone the whole time. I mean, a year on the Moon, a couple of years on Mars maybe. I'll be home from time to time.

Home to help you buy our new life, set things up. And when it's all over... instead, I signed on for four years out by Saturn. Four years of triple pay. And by the time I got here, somebody, somewhere, already knew what was coming.

h.e.l.l.

We could've died together, standing out in the backyard, holding hands, watching the end of the world fall on us from a star-spangled midnight sky.

It was still night the next day, of course, Christie reluctantly feeding me a breakfast of weak tea and algae m.u.f.fins. No jelly, no b.u.t.ter, startling me when she pressed the teabags flat and hung them up to dry.

Of course. When it's gone, there'll be no more tea. I doubt there's b.u.t.ter and jelly any closer than Mars. I liked Mars, with its red sky and pale blue clouds. Part of the base where I was stationed, Oudemans 4, with its fine view of Ius Chasma, was under a clear dome. There was a little garden where some people were trying to grow oregano and poppies. I used to take my breakfast out there, sit and drink my instant coffee, nibble on my Pop Tarts and dream.

How many cups of weak tea can you get from a single teabag?

After breakfast, we suited up and got into the halftrack, squeezing through the airlock one at a time, undocking, then lurching off along the terminal escarpment to where some old eutectic collapse had made a jumbled, sloping path down to the seash.o.r.e.

Other than answering the few questions I could think of, techie stuff about her equipment problems, Christie was silent, looking away from me, troubled. Christ. Everyone I know is troubled. As we watched the murky landscape, foggy with nitrogen mist at two bar, roll by, I said, "How long you been here?" I've met people who came in with the first expedition nine years ago, mostly scientists like Christie Meitner, who've been out in the field most of that time. Some of 'em are a little boggy in the head.

Not looking at me, she said, "Three months. Before that I was on Delta Platform."

Delta Platform, on the other side of t.i.tan, where the Waxsea is an endless, landless, featureless expanse of red-tinted silver-gray. "How long on t.i.tan?"

She turned and looked at me with a slightly resentful look. Some people don't want to... think about it anymore. "A year. I came in with Oberth's last run."

Oberth's last run. She was still on her way home from Saturn, halfway between Earth and Mars when it happened, which is why humanity's under-two-thousand survivors still have an interplanetary vessel. Last time I was back at Alanhold Base, I heard Oberth, damaged when she'd had to aerobrake through an ash-clogged stratosphere, was repaired, was on her way to rescue the Venus...o...b..tal Station personnel.

Two thousand. Two thousand out of all those billions. Jesus.

But all I feel is that one d.a.m.ned death.

Used to be three fusion shuttles keeping our so-called "s.p.a.ce-faring civilization" up and running, running supplies to a few hundred on Mars, a couple of dozen each at Venus, Callisto, Mercury Base, and the Fore Trojans. The four score and ten out here on t.i.tan. Now there's just the one.

Ziolkovskii was caught in LEO, docked to the s.p.a.ce station for repair and refit. I can't imagine why the h.e.l.l people thought she'd be all right, why the station would come through in one piece. Ziolkovskii's crew got real nervous when they saw what was happening. Got their ship undocked and under way. But.

They were transmitting to Moonbase the whole time, which made for one h.e.l.l of a newsreel. All the big impacts were on the other side of the Earth from where the ship and station were at the time, but long before they rounded the planetary limb, you could see rocks rising into her forward trajectory.

Commander Boltano kept transmitting, kept talking calmly, deep, slow voice like nothing unusual was going on, panning his hand-held camera out the command-module's docking window, as the rocks got bigger and bigger, until there was nothing else in sight. His voice cut off with a grunt and the camera view made a sudden, rapid excursion, just before the picture turned to static.

G.o.ddard, still a few days out, making all those wonderful timelapse videos of the impact sequence, exploded as she tried to aerobrake. I guess by the time Oberth got home a couple of months later, things had settled out a bit.

We got to the seash.o.r.e, running down a long detritus slope, and pulled up to the research platform, which looked a little bit like those old-style unmanned landers, some of them going all the way back to the 1970s, you find scattered around the surface of Mars.

Beyond it, the flat, empty surface of the Waxsea stretched away like an infinite table, until it was lost in low, dark red mist. Behind us, the delicately folded face of the Terra Noursae terminal escarpment towered like cornflower blue curtains, mostly exposed water ice, the beach we stood on cracked icebits strung through with ropes of peach-colored polymer and black strands of asphalt.

Down by the mean datum, t.i.tan's sky really is orange, dull orange even at night, with only invisible Saturn's glory for light, and it seems awfully far away overhead.

Christie was looking at me, face no more than shadowed eyes seen through her suit's visor. "Can we get started? I'd like to get back to work."

"Sure."

Funny thing. There were old snowmobile batteries scattered like a perimeter fence around the instrument package, seated in the beach "sand," tilting at angles like so many silent sentinels. As she showed me what was wrong, she kept looking away, looking out at the beach beyond.

I got to work on her problems, easily fixed, mostly shorted out capacitors and the like, carefully packing each ruined component in my toolkit as I replaced it. We used to throw these things away, but... well, maybe somebody can figure out how to fix solid states, one way or another. We sure as h.e.l.l aren't going to make new ones out here. Not for a long time, even if...

Moonbase keeps talking about component fabrication, but it's just p.i.s.sing in the wind. Watching that newsreel, my buddy Jimmy Thornton, who'd come in on the same flight as me, was scheduled to go home with me, commented there must be plenty of good hardware sitting in collapsed, half-melted warehouses on Earth.

Sure. Maybe we could repurpose a Venus lander and get it back to LEO. Figure out where to land, get what we needed, get back up.

Later that night, Jimmy cut himself with a utility knife, not leaving a note behind.

Maybe he figured I wouldn't miss him.

Maybe he figured I'd be along shortly.

Christie watched me work for a while, maybe not trusting that I knew what was what. Scientist types are like that. After a while, she wandered off, and, as I worked, I could see her s.p.a.cesuit drifting about the beach, white against the colored background of t.i.tanscape, out beyond the ring of abandoned hardware sentinels.

Something else we need to rescue. Ruined batteries are easy enough to fix, especially when you've got plenty of chemicals just lying around.

Finished, I b.u.t.toned up, turned, and watched her for a bit.

She had her back angled toward me, walking around the perimeter, half turned away, watching the ground. Every now and again she'd take a quick step outward, seeming to dance like a child, then stand and watch.