Act I: The Spark

Thomas Rayner woke at 0600 station time. He switched on the overhead light. The LED panel illuminated the cabin in pale blue. He sat up on his bunk. He pulled on his trousers and a shirt. He went to the nutrient dispenser. He selected Option A: protein bar, electrolyte solution, multivitamin. He ate the protein bar. He drank the electrolyte solution.

He checked system diagnostics. Life support: nominal. Radiation shielding: nominal. Communications array: nominal. Deep-space monitor: nominal. He ran a diagnostic on the deep-space monitor. It completed in forty-seven seconds. All parameters within acceptable range.

He opened the monitoring display. The background radiation map filled the screen—a wide-band spectrogram showing electromagnetic activity across the frequency spectrum. Most of the spectrum was flat, a nearly featureless plain of low-level noise from cosmic background radiation and the thermal emissions of dust and gas. Occasionally there were spikes: a pulsar here, a quasar there, the radio burst of a magnetar flickering across the display like a flame in wind.

At 0613 station time, he saw something that was not there yesterday.

A narrow-band signal, coming from the Alpha Centauri direction. Frequency: 1420.405 megahertz. The hydrogen line. The most stable frequency in the universe. The signal was pulsing at exactly 1.3-second intervals. Not a pulse train. Not a modulated signal. A single-frequency carrier, turning on and off, on and off, on and off, with the precision of an atomic clock.

Thomas ran a confirmation scan. Same signal. Same frequency. Same interval. He checked for interference. Local equipment was not transmitting at 1420 MHz. Solar activity was minimal. No known Earth-based sources in that direction. The signal was coming from Alpha Centauri.

He took a sample log entry. Time: 0613. Source: Alpha Centauri direction. Frequency: 1420.405 MHz. Period: 1.3 seconds. Classification: unknown. Action: scheduled for further analysis.

Act II: The Currents

He analyzed the signal for three days. The analysis was straightforward. The signal was not modulated. It carried no data. It was not a message. It was a carrier wave, a single tone that turned on and off at a regular interval. The on-off pattern was a square wave, mathematically perfect. The frequency was stable to within 0.001 Hz.

It was a pulsar.

Thomas knew what a pulsar was. He had studied astronomy as part of his training at the Cygnus Prime academy. A pulsar is a neutron star—a star that has collapsed under its own gravity to a diameter of perhaps twenty kilometers, spinning at high speed, emitting beams of radiation from its magnetic poles. As the star spins, the beams sweep across space like the light of a lighthouse. If a beam happens to point toward an observer, the observer sees a pulse. Once per rotation. Every rotation. For as long as the star spins.

The Alpha Centauri pulsar had been spinning for perhaps a million years. It would continue to spin for perhaps another million. Its pulse was not a message. It was not directed at anyone. It was the rotational signature of a dead star, and the fact that Thomas's deep-space monitor happened to be pointed in its direction at the moment the station's automated scan routine was running was a coincidence with no significance.

Thomas filed an anomaly report via data burst to Mission Control at JAXA headquarters in Tokyo. The report included the signal parameters, his analysis, and a recommendation for follow-up observation.

He continued his daily routine. Wake at 0600. Nutrients. Diagnostics. Monitoring. Exercise for thirty minutes. Nutrients. Monitoring. Sleep at 2200. The pulsar appeared on the secondary display every time he ran a sweep of the Alpha Centauri direction. A green line, rising and falling, rising and falling, at 1.3-second intervals. He did not spend extra time looking at it. He did not avoid it. He noticed it the way he noticed the ambient temperature reading on the life support panel: a number that was there, that had been there, and that would presumably continue to be there.

Seven days after filing the report, the data burst from Mission Control arrived. It was a standard automated response:

"Report #A7-4192-067 received. Signal classified as pulsar J1420-6002. Logged in catalog. No further action required. Proceed with scheduled maintenance."

Thomas read the response. He closed the message window. He returned to the monitoring display. The pulsar was still pulsing. 1.3 seconds. On and off. On and off.

He continued his routine.

Act III: The Handover

Three months later, the relief transport arrived. Thomas watched it approach from the observation window—a white vessel against the black sky, its docking lights blinking in the standard sequence. It docked at 1400 station time. Engineer Priya Sharma emerged from the airlock at 1417.

She was twenty-nine, Indian, with short black hair and the compact efficiency of someone who had been in space longer than she had been on Earth. She carried two bags and a data tablet. She greeted Thomas with a nod.

"Watcher Reed?"

"Yes."

"I'm Engineer Sharma. I'll be taking over."

"I know. I've been reading your file."

They spent ten days working together. Thomas showed her the station systems, the monitoring equipment, the maintenance procedures. Priya was competent and thorough. She asked good questions. She took detailed notes. She did not ask about the pulsar.

On the seventh day of the handover, Thomas mentioned it. They were in the monitoring cabin, running a joint diagnostic on the deep-space array. The pulsar was visible on the display—a green line moving steadily, 1.3-second intervals, Alpha Centauri direction.

"There's a pulsar in the Alpha Centauri direction," Thomas said. "One-point-three-second period. You might want to note it on the background catalog."

Priya glanced at the display. "Noted."

"Run a frequency sweep on the secondary panel. It shows up clearly there."

She ran the sweep. The pulsar appeared on the secondary display. She logged it.

"Anything unusual about its emission profile?" she asked.

"Normal for a millisecond pulsar. Stable period. Narrow bandwidth. No evidence of binary companion."

"Understood." She made a note on her tablet. "I'll include it in the handover report."

The handover was complete on the tenth day. Thomas packed his personal effects: photographs of coastlines, a thermos, a book of poetry, a watch his father had given him. He signed out the equipment. He handed Priya the monitoring logs, which included six pages on the Alpha Centauri pulsar.

"There's a pulsar in the Alpha Centauri direction," he said again, the same words, the same delivery. "One-point-three-second period. It's on the secondary display."

Priya: "Noted."

Thomas: "You can find it on a frequency sweep. 1420.405 megahertz."

Priya: "I have it."

Act IV: The Aftermarket

Thomas boarded the transport vehicle at 0800 station time on cycle 4192.158. The vehicle detached from Ares-7 at 0807. He sat in the observation seat and looked out the viewport.

Ares-7 became smaller as the vehicle gained distance. The station was a small structure: a central hub with three radiating arms, each ending in a dish antenna or a solar array. It looked fragile against the vast dark. It was fragile. It was held together by rivets and routine and the quiet determination of people who had been assigned to places like this and had done their jobs for eleven years without complaint.

Mars filled the viewport as they approached the transfer orbit. The planet was a rust-colored sphere, its polar caps white, its great divides and canyons visible even from the distance of low orbit. Thomas had not been to Earth in seven years. His last visit had been a brief stop at the Cygnus Prime relay station, three weeks of shore leave spent walking along a coastline he had visited as a boy and remembered with more clarity than he deserved.

He closed his eyes. He thought about the pulsar. Not with wonder. Not with disappointment. It was a fact. A dead star spinning in the dark, emitting radiation at a regular interval. Nobody was listening. Nobody needed to listen. It pulsed regardless.

The transport vehicle entered the transfer orbit. Earth would be visible in approximately six hours. In twelve hours, he would begin the descent sequence. In twenty-four hours, he would be standing on a coastline again, and he would not know which one, because he could not remember which coastlines he had visited and which ones were photographs.

The pulsar continued to pulse. On the secondary display of Ares-7, now operated by Engineer Priya Sharma, the green line rose and fell, rose and fell, in the Alpha Centauri direction, at 1.3-second intervals, above a planet that was not looking, at a frequency that nobody was hearing, from a star that had been spinning before human beings existed and would continue to spin long after they were gone.

Thomas Rayner slept.