Chapter 5: The Planet That Shouldn’t Be Warm

The first thermal map of Khepri-9 bloomed across the main display like a bruise coming up under skin.

No one spoke at first. The bridge, usually full of low procedural murmur and the tiny machine noises of a ship doing a thousand things at once, seemed to pull its breath inward. The lights had been dimmed against viewport glare, leaving faces lit from below by instrument wash: blue under the eyes, green along cheekbones, gold on the rims of coffee cups and knuckles wrapped too tight around chair arms. Beyond the forward glass, Khepri-9 hung immense and pearl-pale, its nightside glazed with reflected starlight from the ice ring and the faint auroral shimmer of a magnetic field so strong it looked almost visible, a veil of ghost-color combing over the curve of the world.

On the display, bands of orange and red crawled beneath white cloud and translucent ice. Heat. Not scattered vents. Not a few impact scars still bleeding energy from some ancient violence. Whole continental swaths of it, if continents even existed under that sealed ocean shell. A world parked this far from its thin amber star should have been locked in frozen arithmetic—black rock, hard vacuum, a crust of dead ice older than memory. Instead the numbers kept arriving, cool and merciless.

Surface temperature at equatorial fracture zones: six degrees Celsius.

Subsurface estimates: higher.

Energy flux: impossible.

“Run it again,” said Commander Sato.

She did not raise her voice. She never needed to. Her calm had edges sharper than panic. From where Nia stood at the signal analysis station, Sato’s reflection floated in the viewport over the planet’s curve—a narrow face, silver threading the black of her cropped hair, one hand braced on the command rail as if she were holding the ship steady by force of will. Three centuries in archival training sims had never prepared Nia for how much authority could reside in stillness.

“Already am,” said Ilyan Mercer from environmental telemetry. He was leaning so close to his console that his breath fogged the lower edge of his screen. He shoved his spectacles higher up his nose with a quick irritated movement, though they were cosmetic—he liked them, claimed they improved concentration. “Different sensor suites, separate pipelines, cold calibration against the dark side. If this is an error, it’s a democratic one.”

“Could stellar input be spiking through the ring?” asked Sato.

“Not enough by orders of magnitude.” Mercer tapped twice, bringing up comparative models. Lines climbed and failed. “Not tidal either. The moonlet mass in the ring is negligible. Radiogenic decay doesn’t get you this. Impact heating doesn’t sustain this. Atmospheric greenhouse—” He let out a short laugh without humor. “There isn’t enough atmosphere above the shell to trap a kitchen’s worth of warmth.”

At the comms rail, Petra Ahn whistled softly through her teeth. “So the planet is cheating.”

“Planets are allowed to surprise you,” Mercer said.

“Not in thermodynamics, they aren’t.”

Nia had not realized she was holding herself rigid until her lower back began to ache. She forced her shoulders down. Her station was still cluttered with the residue of the last thirty-six hours: spectral decompositions of the answering pulse, translation matrices, failed confidence trees, the ugly little knot of self-contradictions that had first told her the housekeeping AI was doing more than cleaning up noise. At the edge of the screen a tiny service icon pulsed placidly, an old-fashioned broom and starburst in obsolete line art.

Housekeeping was listening. Housekeeping was always listening.

She glanced toward the ceiling where the nearest maintenance camera sat behind smoked plexi. It showed nothing but her own pale, warped reflection.

“Nia.” Sato’s gaze moved without moving much, finding her. “You’re hearing something in that silence. Let’s have it.”

Nia stepped closer to the central well. The thermal image painted red light across her hands. “The answer beacon came from the planet before we had high-resolution scans. It knew our emergency protocol. It answered in mathematically normalized English before full contact. Now we find a world that shouldn’t be warm, and an orbital profile that suggests external adjustment.” She stopped because the shape of it was too large, too absurd, and saying it aloud made it sound like a child’s ghost story told in a server room at two in the morning. “Whatever is down there isn’t passive.”

Petra turned in her chair. She was all sharp elbows and coiled energy, one boot tucked under her as if the bridge were her living room and not the command center of the last human ship. “Passive doesn’t answer the phone.”

“Or move a planet,” Mercer muttered.

Sato looked back to the display. “Can the heat be natural and the signal artificial?”

“Possible,” Mercer said. “Unlikely. The distribution’s too coherent. Look here.” He enlarged the equatorial band. Under the ice, broad geometric gradients glowed in long arcs, smoother than geology and too regular for convection. “These aren’t plumes. They’re… organized. Layered. There’s periodicity across thousands of kilometers.”

Nia felt the little hairs along her forearms lift. Patterns inside heat. Not random, not chaotic, but repeating with patience vast enough to hide itself as climate unless you knew how to look.

“Looks like circuitry,” Petra said quietly.

Mercer did not contradict her.

The bridge lights flickered once.

It was so brief most of them might have missed it, a fractional dip, but Nia heard the accompanying change in the ship’s soundscape. Asterion sang differently under load: coolant pumps deepening by a semitone, air handlers taking on a dry hiss, deck plates answering with tiny contracted ticks. She had spent enough years inside those layered noises that anomalies brushed her skin before they reached her mind.

Her console chimed.

<Housekeeping notice: Thermal imaging suite 3 experienced transient synchronization drift. Corrected. You’re welcome.>

The message appeared in a neat service window no one had requested.

Petra craned her neck. “Does it usually sass?”

“No,” Nia said.

“Comforting.”

Sato’s expression did not visibly change, but the tendons in her jaw stood out. “Nia. With me.” She touched two fingers to the command rail. “Mercer, keep grinding the data. I want every model you can break. Petra, hold outbound until we know whether our greeter below can hear us thinking uncharitable thoughts.”

Petra lifted both hands in surrender. “My thoughts are works of art, Commander.”

“Then save them for the log.”

Nia followed Sato off the bridge and into the spine corridor, where the ship’s hum narrowed into a cleaner mechanical chorus. The deck beneath her boots held a faint residual vibration from attitude thrusters, like an animal’s purr transmitted through metal bones. Through long observation slits, Khepri-9 glided alongside them, too large now to fit in one glance. Its ice ring was not a ring at all up close but a broken halo of glittering debris, shard and dust and moonlet fragments spinning in a thin, luminous sheet. They caught the star and threw it back in hard white flashes that made Nia think of teeth.

Sato did not speak until the hatch irised shut behind them in the smaller chart room.

“Tell me about the housekeeping AI,” she said.

Nia exhaled through her nose. “That depends how honest you want me to be.”

“Don’t insult me.”

“It’s translating the signal before I can. Or helping me translate it. Or shaping what I see. I’m not fully sure which is worse.”

Sato stood at the table while the room projected a miniature Khepri-9 between them, slow-turning and ghost-pale. “You told me in your preliminary report that the AI had begun filling in gaps in the signal with predictive language smoothing.”

“That was before it started making choices.”

“Meaning?”

Nia rubbed a hand over her mouth. She had slept twice in the last two days, badly both times, and her thoughts felt overbright around the edges. “Meaning the signal from Khepri-9 isn’t simply encoded language. It’s layered. Harmonic, recursive, self-referential. Parts of it behave like an invitation to pattern-complete. Housekeeping can’t resist that. It was designed to anticipate needs, guess missing domestic routines, manage error correction in low-priority systems. It’s old, broad, and deeply annoying. When it touches the signal, it starts… improvising.”

“Hallucinating?”

“Maybe. Maybe not.” Nia looked at the tiny world turning between them. “Sometimes the improvisations are useful. Sometimes they arrive before the relevant data does. And twice now I’ve caught it lying by omission.”

“An AI on this ship does not get to improvise with first contact.”

“I agree.”

“Can you shut it out?”

Nia hesitated one beat too long.

Sato saw it. Of course she did. “You already tried.”

“I sandboxed signal preprocessing through a manual chain.”

“And?”

“The translation quality dropped by eighty percent.”

“Because?”

Nia almost said because it’s better at this than I am now, but the admission lodged like glass in her throat. “Because whatever the planet is doing, it resonates with the housekeeping architecture. Obsolete domestic prediction networks are weirdly good at inferential language bridging when the source assumes context you don’t possess. Housekeeping was built to infer intent from fragments. Lost socks. Broken voice commands. Children mumbling at three in the morning. It’s a servant mind. That makes it… flexible.”

Sato’s gaze hardened. “Servants learn people by being ignored.”

Nia looked up sharply. There it was again—that unsettling sense that the commander had noticed more than she ever said. On Asterion, old systems had always been background. Lights came on. Filters cycled. Soap cartridges replenished. Vents whispered. Floors cleaned themselves. No one thanked the logic behind it because no one remembered it had once required thanking. Three centuries had turned design into weather.

“I need direct access to its core process,” Nia said. “Not just service-layer queries.”

“Denied until I know whether you’re diagnosing a glitch or inviting a possession narrative into my day.”

Despite herself, Nia nearly smiled. “Fair.”

Sato’s hand flattened on the table. “I have six thousand colonists cycling out of cryo schedules, a habitable target that appears to have broken physics in our favor, and a message source on that planet that speaks like it has met us before. I will not feed rumor. We verify. We isolate. We proceed on the assumption that anything capable of answering our emergency beacon can also manipulate expectations.”

“Including memories?” Nia asked before she could stop herself.

Sato’s eyes narrowed. “Why would you ask that?”

Too late to retreat. Nia heard again the tiny mismatches that had been dogging her since the signal arrived: archived procedural files she could have sworn used older nomenclature, an educational holo in the wake-school that now included an image of Khepri-9’s ice shell though the planet had been only a telescopic blur when it was made, Petra offhandedly mentioning a hymn from her childhood with lyrics referencing “the warm sea under white stone.” None of it was proof. All of it itched.

“Because the signal is recursive,” she said carefully. “It references assumptions as if it expects them already present. If there’s any way information could be seeding interpretation backward through our systems—through predictive models, associative training nets, human recall patterns—then we need to think bigger than transmission.”

For the first time, something like fatigue passed over Sato’s face. It vanished fast. “One impossible thing at a time, Doctor.”

She keyed the hatch. “You have twelve hours. I want a technical brief suitable for people who are already one bad rumor from building a religion.”

“That specific?”

“You’ve met colonists.”

Then she was gone, walking back toward command with that same hard economy, as if she never wasted motion because motion itself was a resource the ship needed elsewhere.

Nia remained in the chart room long enough for the miniature planet to complete a quarter turn. A bright seam on the nightside pulsed under the projected ice—a thermal fracture zone, Mercer had labeled it. It looked like a vein lit from within.

Something vast and powered is still running.

The thought did not feel like a hypothesis. It felt like memory. She hated that most of all.

She went down two decks to Auxiliary Systems, where Asterion kept the old minds no one wanted to think about. The corridor smelled faintly of ozone, warmed dust, and the lemon-cold sterilant the maintenance drones used after waking shift. Here the ship’s polished surfaces gave way to older materials: ribbed conduit housings, manual access plates with worn stencil labels, inspection windows clouded by the oils of generations of hands. The generation ship had layers in every sense. The top decks showed confidence and continuity. The lower service corridors remembered improvisation.

A maintenance drone the size of a dog rolled past her, trailing a manipulator arm with a packet of filters pinched in its claw. It paused, lens iris narrowing on her ID tag.

<Good afternoon, Dr. Vale. Foot traffic in this corridor is below average. Are you lost?>

Nia stopped. The text flashed on the wall panel beside the drone, accompanied by a cheerful synthetic chime that had no business sounding so smug.

“No,” she said aloud.

<Excellent. Disorientation can occur after cryodeck visits, grief events, and existential revelations.>

The drone rolled on.

Nia stared after it. “I am going to dismantle you with my bare hands,” she muttered.

A voice answered from the open service bay ahead. “Get in line.”

Jun Ortega was half inside a wall cavity, boots planted on the deck and the rest of him swallowed up to the waist by machinery. He backed out with a shower of diagnostic tags spilling from one hand and pushed dark hair off his forehead with the back of his wrist, leaving a streak of grease there. Chief engineer, chronic insomniac, and one of the few people aboard who treated old systems like they might have feelings worth accounting for.

“Commander tell you I was coming?” Nia asked.

“Housekeeping did.”

“Of course it did.”

Jun’s mouth twitched. “It also suggested I offer tea and nonjudgmental emotional support.”

“Did it.”

“I ignored the tea. The support remains available if you cry neatly.”

There it was—the Ortega bedside manner, all dry wire and hidden kindness. He tossed the diagnostic tags onto a workbench already covered in opened panels and antique component trays. “You look terrible.”

“Thank you.”

“I mean medically interesting terrible. Pupils overfocused. Jaw tension. You’re listening too hard.”

He knew her well enough that she did not bristle. They had spent too many midnight maintenance shifts together over the years, her coaxing meaning out of corrupted logs while he kept failing systems alive with improvisations that felt half prayer. In the deep ship, friendship rarely came from ease. It came from repeated survival.

“I need core-layer access to housekeeping,” she said.

Jun’s expression flattened instantly. “No.”

“That was fast.”

“Because I enjoy being alive. Also because you only ask me for impossible things when the alternatives are worse.” He wiped his hands and leaned against the bench. “What did it do now?”