The Long Way Past Vashti

Vashti's Rings

The probe came back up out of the ring plane trailing a faint glitter, and Sabine caught it with the arm on the first pass, which pleased her more than it should have.

"Clean grab," Ezra said from the engineering couch. He didn't look up from his board. "You're showing off."

"I'm practicing." She eased Gannet's Wake off the edge of the ring and let the sloop drift a little above it. Below them, Vashti's rings ran out to either side in bands of cream and rust and dirty white, so wide that the eye stopped trying to find their ends. The planet filled the upper half of the forward glass, banded and slow, its storms smeared into long ochre ribbons. They had been in orbit only a few hours. She still hadn't gotten used to it.

Noor came up from the sample bay with frost on her sleeves. "That's ordinary water ice, mostly. A little silicate dust. It's lovely, and it's boring." She pulled herself into the third couch and buckled in loosely. "I want to do the next dip a bit farther out. The grain sizes change across the band, and I'd like the whole sequence before we start chasing anything."

"We'll get your sequence," Sabine said.

She meant it. That was the job they'd been contracted for, and it was decent work: walk the ring outward one band at a time, sample, log, move on. Ezra had calculated their fuel for exactly that slow march. Noor had built her whole analysis plan around it. Sabine flew the next three dips the way they'd agreed, gentle passes skimming the top of the ring, the probe dropping down on its tether and coming back up crusted in grit. Each time the arm took it home, the hull ticked as the bay cycled. Each time, Noor's voice came up on the intercom with a new line of results, patient and quiet.

It was after the fourth dip, with the probe secured and the sloop coasting in the planet's shadow, that Sabine unstrapped and went down to the bay herself.

The sample rack ran along the inner wall in neat rows of padded slots. Most held the fresh tubes Noor had filled that afternoon, each one labeled, each one rimed white. One slot near the end held a tube that didn't match the others. It was older, the titanium gone soft gray with handling, and the lathe marks still showed in fine rings along its length. Near the cap someone had laser-etched two small initials.

Sabine didn't touch it. She waited for Noor to drift in behind her, and then for Ezra, who came more slowly, wiping his hands on a rag.

"That one's still empty," Noor said. Her voice had gone careful. "I was saving it."

"I know what you were saving it for." Sabine turned. "Your mother made it, didn't she?"

"For her own fieldwork. Before I was born." Noor reached past her and touched the cap with one finger, the way someone touches a sleeping animal. "She told me to fill it with something worth carrying home."

Sabine nodded. She pulled her slate from her thigh pocket and woke it, and the chart she'd been staring at for most of the trip spread across the screen: Vashti's rings in false color, the bands marked in Noor's tidy annotations. Then she widened it inward, toward the planet, where the rings thinned and darkened and a narrow lane of near-nothing cut through them.

"The Gap of Selm," Ezra said. He didn't sound surprised. He'd seen her looking at it.

"My old teacher spent most of her career on this lane." Sabine kept her eyes on the slate, because it was easier. "She thought the moonlet that sweeps it clear is doing more than sweeping. It flexes when it passes. It warms. She thought it was cooking the material at the Gap's edges into something richer than ice. Organic chemistry. Long chains, maybe. Nobody would fund the run. They said the inner ring was too dense to fly and the data was too thin to justify it."

"Was it?" Noor asked.

"The data was thin." Sabine finally looked up. "She died with it thin. And now there's a rumor out of the last flyby, a spectral smudge right where she said it would be. Someone else is going to come for it. Soon."

Ezra folded the rag and tucked it away. "Someone being Cato Brandt."

"Someone being anybody with a ship and a sponsor who reads the same rumors I do."

The bay was cold enough that their breath showed faintly. Noor looked from one of them to the other. "Our plan has us working outward. The Gap is the other direction."

"I know."

"How would you even get in there?"

Sabine drew it on the slate with her fingertip, a curve dropping inside the main ring and running down through the dark inner bands, then across the Gap and out the far side. It was a short line. It looked simple. "We thread it. Fast, straight down through the inner ring, one dive with the probe at the Gap's edge, and out again before anybody else gets close."

Ezra was quiet for a moment. When he spoke, he spoke slowly, which meant he'd already started working the problem. "The inner ring's full of stuff. Not grit. Pebbles, some bigger. At speed, a pebble isn't a pebble."

"The shielding's rated for it."

"The shielding's rated for occasional. You're drawing a line through constant." He tilted his head at the slate. "And we've got two cooling loops, Sabine. Both of them run along the outboard side of the probe housing. If something punches the housing on a dive, we're working with one, and one won't carry us through a long burn and a hot instrument run at the same time."

"Then we don't do a long burn."

"Then you're doing the whole thing on a thin margin with no rehearsal." He didn't raise his voice. He never did. "You haven't mapped the lane. You haven't run the particle counts. You've got a rumor and a curve you drew with your finger."

She wanted to argue, and found she couldn't, not honestly. He was right about all of it. She'd been planning this run in her head for months and had built none of it on anything solid.

Noor spoke into the silence. "When I signed on, you said something to me. Do you remember?"

Sabine remembered. She'd said it in a docking corridor with Noor's bag still on her shoulder, and she'd said it to Ezra years before that, on another ship. "I said I'd bring you home."

"There are three of us aboard," Noor said. "That's the whole list. If you take this ship through the inner ring, it's all three of us going."

"I know that too."

Ezra was watching her, not unhappily, with the look he wore when he was waiting to see which way she'd fall. She'd learned to read that look over a lot of long watches, the way you learn the shape of a room in the dark. Sometimes she caught him at it when he thought she was busy with the board. She never said anything. Neither did he.

"Give me two days," she said. "We finish Noor's sequence on the outer bands. Ezra, you rebuild the shielding numbers for a real particle environment, not the brochure. Noor, pull every scrap of spectral data on the Gap edges you can find. If the run looks impossible when we're done, we don't take it."

"And if it looks merely stupid?" Ezra asked.

"Then we talk."

He let out a breath that was almost a laugh. "That's not a no."

"It's not a yes either."

Noor reached into the rack and lifted her mother's tube out of its slot. She turned it once in her gloved hands, catching the bay lights on the etched initials, and then she put it back exactly where it had been. "It stays empty until we know," she said. "I'm not filling it with a guess."

"Fair," Sabine said.

She went back up to the flight deck alone. Through the forward glass the rings had swung into sunlight again, bright enough to make her squint, and far down toward the planet she could just make out the dark thread where the Gap cut through. It looked like nothing. A pencil line on a page.

She set the slate in its cradle, pulled up the master chart, and with one deliberate stroke drew a small ring around the Gap of Selm, and beside it, in her own cramped capitals, wrote her teacher's name.

Perihelion Kite

The proximity alarm chimed once, softly, the way it did for anything that wasn't a rock, and Sabine had the long-range optics swung around before Ezra finished saying her name.

A bright point was sliding along the outer edge of the rings, too steady to be ice. It brightened as she watched. That was the drive cutting off and the ship turning to show its flank to the sun. She knew the silhouette before the transponder resolved: the stubby radiator vanes, the long sampling boom folded along the spine like a heron's leg.

"Perihelion Kite," Ezra said. He'd come up from the engineering crawl with grease on one cuff and a slate under his arm. "He made good time."

"He burned hard to get here." She could see it in the orbit he'd settled into, low and fast and already matched to theirs. Cato had spent fuel he wouldn't get back. "He's not here to look around."

The comm light came on a moment later. The two ships were close enough now that the lag had shrunk to nearly nothing, and when Cato's face filled the side screen his voice came with it, no gap, as if he were sitting across a galley table.

"Captain Okwuosa-Reyne." He looked tired. He'd let his beard go, and the lighting on his bridge made the grey in it look like frost. "I'd hoped we'd be the first ones. I see we're not."

"You're welcome to the outer bands," she said. "There's plenty of ring."

"There's plenty of ring," he agreed. "There's only one Gap." He leaned back, and she saw the rest of his flight deck behind him, two crew at stations, one of them pretending not to listen. "I'll be honest with you, because I don't think either of us has time to be anything else. My backers gave me one season. If I come home without a first claim on Selm, the Kite gets sold for parts and my people go looking for work. That's not a threat. That's my ledger."

Ezra had gone very still beside her. Sabine kept her hands flat on the console.

"So what are you offering?"

"Let me take the inner run. I've got heavier shielding than you, and you know it. I'll put your ship's name on every paper next to mine, and you get the raw data the hour I have it. Every spectrum. Every grain count." He spread his hands. "You'd get your answer. You'd just get it second."

It was a fair offer. That was the worst of it. She'd known Cato a long time, at conferences and in docking queues, and he'd never once lied to her about a number. If she said yes, the Gap would be sampled, the theory would be tested, and her crew would never go near the inner ring.

And her teacher's name would be a footnote under his.

"I need to talk to my crew," she said.

"Of course." He hesitated. "Sabine. I watched your last pass on the outer edge from a long way off. You've got a lighter hull. Don't do something because I showed up."

She cut the channel. The screen went dark and gave her back her own reflection, which she didn't care for.

Ezra set his slate on the console between them. "You asked for real shielding numbers. Here they are."

She read them. They weren't impossible. They were bad, in the patient, grinding way that meant a run would work most of the time, until it didn't. The inner ring wasn't a wall of boulders. It was a fog of fine debris moving almost with them, and almost was the problem. Every grain came in slow by orbital standards and still fast enough to punch through anything they carried.

"He's right about his hull," Ezra said.

"I know."

"He's right about the offer, too."

"I know that." She scrolled back to the top of his figures. "What I don't know is what's in there. Nobody does. If I fly the ship in blind and the particle field is worse than your model, we find out the hard way, with all three of us aboard."

"So don't fly the ship in."

She looked up. He was leaning on the back of the copilot's chair, close enough that she could smell machine oil and the cheap citrus soap he bought by the case. He wasn't smiling.

"Send a probe," he said. "Not tomorrow, not after the outer sequence. Now. If it comes back with a clean density map, you've got your route and you've got proof you didn't need his hull. If it comes back in pieces, you've got your answer the cheap way."

"You wanted the full two days for prep."

"I wanted a lot of things." He said it lightly, and then for half a second he didn't look light at all, and she had to look back at the slate. "The probe's ready. I finished the housing this morning. Loops are charged."

She called down to the sample bay. Noor answered with her sleeves pushed up and a smear of ring dust on one cheek, and listened without interrupting.

"An early dive," Noor said. "Before the Kite can get a probe of its own in."

"Before I decide anything with this ship," Sabine said. "That's the point."

"Is it?" Noor's gaze flicked past her, to the dark side screen. Then she shrugged. "My outer sequence can run on automatics for a few hours. Put the spectrometer head on it. If there's anything organic in the Gap, I want to see it in the probe's own light, not in his."

"Done," Ezra said, already moving.

Sabine followed him down. The probe sat in its launch cradle in the lower bay, a squat cylinder no taller than she was, its housing still bright from the polishing. Both coolant loops ran along the outboard side in parallel silver lines, the way Ezra liked them, where he could reach them without unbolting anything. He ran his palm along them once, checking the fittings by feel, and she noticed that he did it the way some people touch a doorframe on the way out of a house.

"You'll lose her if the field's bad," he said.

"Then I'll lose her."

"I built her."

"I know you did." She stood beside him a moment longer than she needed to. His shoulder was almost touching hers. Neither of them moved it. "Seal it."

He sealed the housing. The bay doors cycled, and the air went out in a long hiss she felt through her boots more than heard, until there was nothing to carry sound at all and the bay was silent except for her own breathing in her helmet.

Back on the flight deck she reopened the channel. Cato answered at once. He'd been waiting.

"I'm not yielding yet," she told him. "I'm sending a probe into the inner ring. If it maps a safe line, I'll fly it. If it doesn't, we'll talk again."

He was quiet long enough that she thought the link had dropped. "You understand that if your probe finds the organics first, my backers won't care whose hull went in."

"I understand."

"Then I hope it's a clean map," he said, and to her surprise he sounded like he meant it. "For your crew's sake."

She closed the channel without answering. Ezra slid into the copilot's chair and brought up the launch board, and his hand rested on the release a moment, waiting for her.

"Your call, Captain."

Through the forward glass the rings stretched away toward Vashti in bands of pale gold and slate, and the Gap of Selm lay below them like a thin dark seam stitched through the bright. Sabine touched the release herself.

The cradle let go. The probe drifted clear of the hull, turned on its gas jets in silent puffs of frost, and lit its small drive. She watched the spark of it fall away from them, smaller and smaller, down toward the inner ring, until it slipped past the bright edge and into the dust.

Frost on Glass

The probe's telemetry came in ragged all through the night watch, and by morning Sabine had stopped pretending to sleep. She sat on the flight deck with her knees drawn up, watching the map build itself line by line: a corridor through the inner ring, narrow and twisting, the dust thinning in places like breath on a cold window. Noor floated behind her with a bulb of tea she hadn't touched, reading spectra off the side panel.

"There," Noor said. "That shoulder in the absorption. That's not water ice."

"Organics?"

"Something with carbon in it. I'd want a sample in hand before I'd swear to anything." Her voice had gone thin and fast the way it did when she was trying not to hope. "But it's there. Your mentor wasn't wrong about the Gap."

Sabine let that sit in her chest a moment. Then the probe's return burn lit, small and blue on the long-range display, and she called Ezra up from the bay to catch it.

He came forward wiping his hands on a rag. "She held together?"

"She did. Bring her home and we'll see what she brought us."

The probe climbed back toward them out of the dust in a slow arc, and Ezra flew the capture himself, nudging the Gannet's Wake into position with little taps on the attitude jets. Sabine watched the cradle arms open in the bay camera. The probe slid in, a pale cylinder scuffed gray now along one flank, and the arms closed.

That was when the hull rang.

It wasn't sound, not out there, but the ship carried it: one hard jolt through the frame, through the deck, through the bones of her feet. A ring particle, something no bigger than a fingernail, had followed the probe out of the plane and caught the Wake on the outboard side, right where the cradle held its catch.

Alarms bloomed across the board. Sabine's eyes went to the bay camera. Along the probe housing, and along the ship's own coolant run behind it where the probe's loops had been coupled in for recovery, a fan of glitter was spraying into the dark. Ice. Coolant boiling off into vacuum and freezing as it went, a sheet of bright crystals turning in the floodlights like snow caught in a headlamp.

"Loop two's venting," Ezra said. He was already out of the chair. "Pressure's falling. If it pulls the shared manifold down, we lose both."

"Isolate it from here."

"Valve's not answering. The strike must have taken the actuator." He kicked off toward the hatch. "I have to close it by hand."

"Ezra, the bay's at vacuum."

"Then I'll wear a suit."

She wanted to tell him no. She wanted to tell him a dozen things. The reactor heat had to go somewhere, and if both loops failed it would stay inside the ship with the three of them, and there would be no outer route, no inner route, no claim at all, only a long cold drift and a distress call to the one captain she'd been refusing all week. She said, "Go," and hated how easily it came out.

Noor went with him as far as the lock to check his seals. Sabine stayed at the board, because someone had to fly, and the venting gas was pushing the ship into a slow tumble. She fed the jets small corrections and watched Vashti swing across the forward glass, gold and slate, gold and slate. Frost was crawling over the outer pane where the vented crystals had drifted forward and stuck, feathering across the corner of her view.

On the bay camera Ezra came through the inner lock in his suit, a bulky shape in the floodlights, hauling himself along the cradle rail into the glitter. Ice crystals pattered harmlessly off his visor. He reached the manifold housing and bent over it.

"Talk to me," she said.

"Actuator's sheared. I can turn the valve with a bar, but the housing's hot." His breathing came over the channel short and steady. "Loop one's carrying everything now. The manifold's taking all of it."

"How hot?"

"Hot enough."

The pressure reading for the shared line was sliding. Not fast, but it wasn't stopping either. Sabine watched it and thought about the promise she'd made in a port office, two signatures on a contract, Noor's eager and Ezra's slow. I'll bring you home. She'd meant it. She had flown a probe into the dust anyway.

"It's not turning," Ezra said. "Seized. Give me a second."

"Ezra."

"Give me a second."

He braced his boots against the cradle frame and leaned his whole weight on the bar. Nothing. He shifted his grip lower, onto the body of the manifold itself, where the metal had to be ferociously hot from carrying both loads, and pushed again. She heard him make a sound she'd never heard from him.

The valve gave.

The glittering fan thinned, sputtered, and stopped. The last crystals drifted off into the dark and were gone. On the board, the shared line's pressure steadied, wavered, and held.

"Loop two isolated," Ezra said, very quietly. "Bringing myself in."

She trimmed out the last of the tumble with hands that weren't quite right, then left the deck to Noor's care and went down to the lock.

He was sitting on the bench with his helmet off and his gloves still on, staring at them. The palms were scorched dark through the outer layer. Noor knelt in front of him with the medical kit open.

"Let me see," Sabine said.

"It's fine."

"Let me see."

Noor eased the gloves off. The suit had kept the worst away, but the heat had soaked through where he'd gripped the manifold, and his palms and the insides of his fingers were red and blistering, the skin tight and shining. He didn't look at them. He looked at her.

"Loop one's good," he said. "We can run on one if we're careful. No hard burns. Nothing deep in the ring."

"I know."

"I mean it, Sabine. Not on one loop."

She didn't answer. She took the burn gel from Noor and did it herself, spreading it across his palm as lightly as she could, and he let her. His fingers twitched once against her wrist and stayed there.

Noor said, after a while, "I should check the sample bay."

She came back a few minutes later holding something. Sabine knew what it was before she saw it: the titanium core tube, the empty one, lathe-turned and etched with Noor's mother's initials, which had sat untouched in the rack all voyage waiting for the Gap. Noor turned it so they could see. A hairline crack ran across the seal cap where the rack had flexed in the strike.

"It'll still hold a sample," Noor said. "If I tape it. It just won't hold vacuum anymore." She ran her thumb over the letters. "She'd laugh at me for being upset about it."

"I'm sorry," Sabine said.

"Don't be. It's a tube." But she held it against her chest a moment before she pushed off to stow it again, and she didn't look back.

Sabine finished the second hand. She wound gauze around his palm, around each finger, careful over the blisters, until his hands were white and clumsy and useless for days. He watched her the whole time. Through the lock window behind him, frost still clung to the glass in fine feathered lines, catching Vashti's light.

On the panel beside the lock, a single green light marked the cooling loop that was left. She tied off the last of the gauze and didn't let go of his wrist.

The Galley

Sabine came down the spine of the ship feet first, one hand sliding along the rail, and found Ezra already in the galley trying to open a ration pouch with his teeth.

"You could ask," she said.

"I could." He let the pouch drift and caught it against his chest with his forearm. The gauze on his hands had gone grey at the knuckles overnight. "You'd make a speech about it."

She tore the pouch for him and pushed the straw in and held it while he drank. The galley was the warmest room aboard, and it was where everyone ended up when the ship got quiet. On the bulkhead panel the coolant board showed what it had shown since yesterday: one green light, one dark slot. The fans sounded different on one loop. They worked harder, and the pitch rose whenever the reactor throttled up for anything at all.

Noor drifted in behind her with a tablet tucked under one arm and her hair tied back in a knot that was coming loose. "Kite's calling again. That's the third time since you went to sleep."

"I didn't sleep."

"I know. I meant since you went to your bunk and stared at the ceiling." Noor clipped the tablet to the table. "He's patient. I'll give him that."

Sabine looked at the dark slot on the board. Her mentor had drawn the Gap of Selm on a napkin once, in a station canteen, a long time before anyone took her seriously. Two lines for the ring edges and a smear of pencil between them where she swore something had been laid down and kept, cold and patient, since before the moons settled into their orbits. Sabine still had the napkin. It was folded inside the logbook on the flight deck, soft as cloth now.

"Put him through," she said.

Cato's face filled the tablet, a little grainy, a little behind. The Kite was close enough that the lag was only a hitch, the length of a swallowed word. He'd shaved. She found that annoying.

"Sabine. I heard about your strike. Is everyone all right?"

"Ezra burned his hands closing the loop."

Cato's eyes moved off-screen, toward wherever Ezra would be if the camera were wider. "I'm sorry. Do you need anything? We carry a full burn kit. I can match orbits by tonight."

"We're fine."

"You're on one loop."

She didn't ask how he knew. He'd have seen the vent plume on his scopes, a bright scatter of crystals boiling off her hull into sunlight. Anyone watching would have seen it.

"Here's where I am," Cato said. "My backers pull the money at the end of this window if I don't file a claim. That's not a threat, it's a spreadsheet. The offer stands. Co-credit. Every byte of raw data the second it lands. Your mentor's name on the paper if you want it there." He paused, and the lag stretched it. "But I'm going in either way. Tomorrow. I'd rather not do it blind when you've already got a route."

"Give me a minute."

"Take an hour. I'm not going anywhere until then."

She muted him. Nobody said anything. Ezra was turning the empty pouch over against his forearm, not looking at her, which meant he was paying very close attention.

"Say it," she said.

"I said it yesterday."

"Say it again."

He set the pouch down against the table's grip strip. "The inner run means hard burns on the way in, hard burns on the way out, and the reactor hot the whole time. One loop can carry that if nothing else goes wrong. Something always goes wrong in there. That's why it's interesting." He lifted one bandaged hand, then seemed to think better of it and let it float. "If loop one goes, we don't limp home. We cook."

"Noor?"

Noor had her arms folded. "I want the Gap. You know I do." She glanced toward the aft hatch, toward the sample bay and the rack and the cracked tube with her mother's initials on it. "But I signed on because you told me you'd bring me home. I remember the way you said it. You weren't being nice. You meant it like a spec."

"I did mean it."

"So." Noor shrugged, small and miserable. "So that's my answer."

Sabine pushed off and went to the galley port. Vashti hung there, banded cream and rust, so large it no longer looked like a planet but like weather. The rings cut across it as a thin bright blade, and somewhere inside that blade was a dark seam she had spent years plotting toward. She could fly it. She was nearly sure she could fly it. That was the trouble with nearly. She had been nearly sure two days ago too, and Ezra had paid for that with his hands.

There were three people aboard Gannet's Wake. That had never been an abstraction to her. It was the first thing she counted every morning, before fuel or heat or anything else.

She came back to the table and unmuted the tablet.

"Cato. I'm not taking the inner run."

The lag held him still a moment longer than it should have. Then his shoulders came down. He didn't smile, and she liked him a little for that.

"I'm sending you my route," she said. "Everything. The entry corridor, the timing we worked out against the shepherd moon, the debris density off our dive. Where we got hit." Her voice stayed level, which surprised her. "Go in on the second window, not the first. The first one looks cleaner. It isn't."

"Sabine, you don't have to--"

"I know I don't have to." She was already pulling the files across, her fingers quick on the glass. The transfer bar crept along. It seemed to take a very long time for something so small. "File your claim. Bring your people back. And send me what you find, raw, like you said."

"Every byte," Cato said. Then, quieter: "She was right, you know. Your mentor. I read her papers in school. I thought she was crazy."

"So did everyone."

"I'll put her name first."

The link closed. The galley fans whined on and the green light stayed green. Sabine set the tablet face-down on the strip as though it might keep talking otherwise.

"Outer route, then," Noor said after a while. She said it carefully, the way you'd test ice. "The slow arc. I can plan sampling passes along the outer band. It won't be the Gap."

"No."

"It might be something." Noor looked down at her tablet, frowning at a spectrum from the first day's outer passes, something she had flagged and not yet explained. "I keep seeing a smudge in the early numbers. Probably contamination. I'll look." She unclipped the tablet and pushed toward the hatch, then caught the frame and looked back. "Thank you. For keeping it."

"Keeping what?"

"The promise." And she was gone aft.

Sabine stayed by the table. Her hands didn't seem to belong to her. Somewhere back in the logbook the napkin sat folded with its pencil smear, and she had just given its whole meaning to a man with a fresh shave and a spreadsheet.

"Hey," Ezra said.

She turned. He had drifted closer without her hearing him, and he lifted both hands, white and clumsy in their gauze, and laid them on either side of her face. He did it so slowly she could have moved away. The bandage was rough against her cheekbones and warm from his skin underneath. He was holding his palms off her a little, she realized, so the blisters wouldn't press, touching her only with the wrapped backs of his fingers.

"That hurts you," she said.

"Yeah."

He kissed her anyway. It was brief and careful and not careful at all. When he pulled back his forehead stayed against hers, and she put her own hands over his wrists, above the gauze, where it was safe.

"Six years," he said. "You pick today."

"You picked it."

"I did." He almost laughed. "Bad timing. Good call, though."

The board chimed. Through the port, beyond Ezra's shoulder, the Kite's beacon had come up on the tracker, a steady blinking point dropping inward along the line she had drawn for it. She watched it go, falling ahead of them toward the bright blade of the rings and the dark seam she would not touch, until it slipped into the glare and she could only find it on the screen.

Outer Ice

The probe came home slow, the way everything came home now. Sabine eased it in on the thrusters alone, no hard burn, the housing turning a lazy half-circle against the outer band while the sample bay doors opened to meet it. Out here the rings were a pale, loose snowfield. They weren't the bright blade she had flown at on the third day. Grains drifted past the port with nothing driving them, catching sunlight and letting it go.

"Easy," Ezra said behind her. "You're doing fine. Easy."

"I'm barely moving it."

"That's the part I like."

He was strapped at the engineering board with his hands resting palm-up on his thighs, still wrapped. The gauze was thinner than it had been, and he could bend his fingers most of the way now if he did it slowly. He watched the loop temperatures the way other men watch weather. One loop. The readout for loop two still sat on the board, flat and grey, and nobody had found the heart to blank it.

The probe kissed the cradle. The latches took it. Sabine let go of the stick and found her hand didn't want to open at first, and she shook it out.

"Captured," she said. "Noor, it's yours."

Noor was already moving. She went aft hand over hand down the spine of the ship, a tablet clipped to her sleeve, her hair tied back hard. Sabine unstrapped and followed. Ezra came last. He used his elbows on the rungs, which he claimed was faster, and wasn't.

The sample bay was cold enough that their breath showed in the work light. Through the inner window the probe sat in its cradle, its spectrometer head folded against the housing, a crust of frost on the scoop where outer-ring ice had packed itself in. Noor ran the transfer from the glovebox: the scoop rotated, the ice went into the sealed chamber, the chamber warmed by careful degrees so whatever was in the grains would come off as vapor into the head Ezra had built for her.

They waited. The spectrometer did its patient work.

"You flagged something," Sabine said. "From the first day."

"A smudge. I thought it was us." Noor didn't look up. "Outgassing from the housing. Lubricant. Somebody's thumb in the scoop. I've been going through it for days trying to kill it." She tapped the tablet, frowned, tapped again. "I baked the housing before this dive. I flushed the chamber twice. If it's us it should be gone."

The trace drew itself across her screen line by line. Sabine didn't know how to read most of it. She knew how to read Noor, though, and she watched Noor stop moving.

"Noor."

"Hang on."

"Is it gone?"

Noor pulled the tablet off her sleeve and turned it so they could both see, though it wouldn't mean much to them, and she seemed to know it, because she put her finger on a cluster of peaks and held it there like she was pinning something down before it could fly away.

"That's not lubricant," she said. "That's not us. That's the same family. The chains, the ring structures, the nitrogen in them. It's what the old flyby data hinted at in the Gap." She swallowed. "It's here. It's in the outer ice too. Not as much. Thin. But it's seeded all through the band, I'd bet my doctorate on it, I'd bet my ..." She laughed, short and a little wild. "It was on the first day. It was in the first pass and I thought I'd smeared it."

Sabine looked at the peaks under Noor's finger. She thought of a napkin folded in the logbook and a pencil sketch of a ring system with an arrow pointing at a dark seam and a note in her mentor's crabbed hand: it won't stay in one place. Nothing that makes itself stays in one place. She had always read that as poetry.

"She said it would spread," she said. "Outward. She said the Gap would be the source and the rest would carry it."

"Then he was right twice." Noor's voice was steadier now. "Cato gets the source. We get the reach. That's not nothing. That's a whole other paper. That's the part that says it's not a fluke in one gap, it's a process."

Ezra had come up beside Sabine. She felt his shoulder against hers in the cold, the warmth of him through two layers of fabric.

"Second place," he said quietly.

"Different place," Noor said, before Sabine could answer. "Not second."

Sabine didn't trust her voice, so she didn't use it. She nodded.

"I want a physical sample," Noor said. "Not just the trace. Something a lab can cut. Something nobody can say we imagined." She glanced at the rack on the far wall, and Sabine knew what she meant before she said it.

The core tube hung in its clip where they had left it after the strike. Titanium, no longer than a forearm, lathe-turned to a soft dull sheen, and near the cap a ring of etched letters: Noor's mother's initials. Noor had told them once, on the long run in, that her mother had made it in a workshop at home years before Noor ever flew, for a daughter who hadn't picked a field yet. The seal at the cap had cracked on the fourth day when the particle hit. It could hold a taped sample. It couldn't hold vacuum. It couldn't carry anything home that a lab would trust.

"It leaks," Ezra said.

"I know it leaks." Noor's jaw set. "I don't want a new tube. I want that one."

Sabine took it down. It was lighter than it looked, as it always was. She turned it in her hands and found the crack with her thumb, a hairline running around the lip where the cap met the body. "Can we weld it?"

Ezra looked at it a long moment. "Not the cap. You'd never get it open again without cutting it." He held up his bandaged hands. "And not me. I can tell you how. I can't hold the torch steady with these."

"So I hold it," Sabine said.

"So you hold it."

"We cut it open on the ground," Noor said. "That's fine. That's how it's supposed to be done anyway. Seal it here, open it there, in front of everyone."

They filled it in the glovebox, Noor working the cold manipulators herself, packing clean outer-ring ice into the tube a little at a time, tamping it with the small rod, and Sabine could see her lips moving, counting nothing, just talking to it. When it was full Noor seated the cap and gave the tube back through the lock. Its outer skin had frosted white. The initials showed through the frost.

Ezra talked her through it. The small welder from the tool locker, the tip turned down low, the fixture clamped to the bench so the tube wouldn't drift. Purge the bead with inert gas so the metal wouldn't take on what it shouldn't. Work slow around the seam. Don't heat the body, keep the ice cold, keep the arc on the lip.

"Slower," he said. "You've got time. We've got nothing but time."

"You keep saying that."

"Somebody has to."

The arc bloomed blue-white at the tip, and Sabine narrowed her eyes behind the visor and began. The seam took the bead in a thin bright line that cooled to straw and then to blue as she moved past it. Her hand wanted to hurry. She didn't let it. Noor floated at her left shoulder, one hand flat on the bench, close enough that Sabine felt her breathing. Ezra was at her right with his wrapped hands held up and out of the way, watching the seam, watching her. Three of them in the cold bay. Three of them she had promised to bring home.

She brought the arc all the way round, met the start of the bead, and lifted the tip clear.

Nobody spoke. The metal ticked faintly as it cooled. Sabine set the welder down, pushed up her visor, and laid her bare thumb on the seam, warm and smooth and whole, the initials a finger's width below it under their skin of frost.