[ECHO ARCHIVE · LAYER 0 · 0% DECODED · KEY: NONE · NOTE: CARRIER POWER AT STEP 12 · STEP TIME 03:11:44, TWELVE CONSECUTIVE DAYS, DRIFT UNDER 0.4 SECONDS]
The rule of elimination is an old rule: cross off everything on Earth one item at a time, and when nothing is left, whatever remains, however improbable, has to stand.
First crossed off: satellites. The duty desk's catalog held twenty-four thousand objects—bearing, Doppler, telemetry frequency, the full run. In the Cassiopeia direction the elevation sat above forty degrees; the geostationary belt wasn't there; a low-orbit transit has velocity, and this signal was pinned where it stood. Adebayo wrote a script and ran it all night; at dawn the result went up on the whiteboard: zero hits. He dropped into his chair. "Twenty-four thousand objects, and not one of them knows us."
He wasn't done. Next day he ran it again, dead satellites and debris included: thirty-seven thousand targets. Zero again. He pinned the printout beside the whiteboard with four push pins, the way you'd put up a wanted poster. "I arraigned every one of them," he said. "Not one confessed."
Second was aircraft. Aviation telemetry has frequency-hopping patterns—one comparison settles it—and the ADS-B tracks check out too: there were aircraft overhead in those windows, but none on the right bearing, and aircraft don't hover; this signal never shifted its ground. Third was ground radar: one circle of scan modulation and you can name it in a second. Not it. Fourth was every odd mode the ionospheric-scatter models list; the parameter tables were worn limp, and not one mode can sit on the second harmonic of the hydrogen line for a week without moving. When the fifth item came up—the microwave oven—the meeting room went quiet for two seconds, and then somebody laughed out loud.
Case file 1998-041, an old one. Back then, some station spent half a year recording "unknown pulses," and there was a stretch of real alarm, until the trail ended at the staff canteen at the foot of the hill: a microwave oven with an aged door seal, leaking one wave at noon every day. The people heating lunch had been signaling the sky without knowing it. The case appendix still holds a photograph—a handwritten note pasted above the oven: Please close the door while heating. Thank you for your cooperation.
"So the Microwave department enters the shortlist with honor," Adebayo said.
"It's the RF leakage department," I said.
"Microwave is friendlier."
This time it wasn't a microwave oven. The power didn't fit, and the direction fit worse—the canteen stood at the foot of the mountain; Cassiopeia stood in the sky. Crossed off.
The pirate-radio item took us outdoors for real. The spectrogram did hold one illegal broadcast: midnight to four, a medicine program, selling a drug that "activates your cells," the host's voice as if his mouth were full. The bearing didn't match the signal, but the rules require locating it on site and shutting it down. Adebayo and I drove down the mountain with a handheld directional antenna out the car window, taking the city's temperature. Strongest signal: the eighth floor of a self-built block in an urban village, the stairwell papered over with locksmith ads. A man from the building office led us up and knocked; the door opened on a young man of twenty or so—one transmitter, one carton of instant noodles. The moment he saw us he began taking down the antenna, practiced in a way that made you sad. Adebayo gave him ten minutes of regulations; he nodded the whole way through, and at the end asked one question: "So who settles my wages this month?" Nobody could answer that. Equipment impounded; the receipt in triplicate. On the drive back Adebayo said: "Does this count? We go hunting signals in the universe, and first we shut down a medicine seller on Earth." I said: "It counts as crossing one off."
Items six through eleven were the various interferences: satellite TV spill, intermodulation from neighboring stations, illegal broadcasts, military bands, and one kind of entry that had appeared in this institute's ledger exactly three times—"unidentified, never recurred." All crossed off. By the eleventh there wasn't much left on the whiteboard to strike, and the signal was still there. At three eleven forty-four in the morning, the power stepped up one notch, no more, no less, like somebody using it as a time clock.
Items six through ten took two days. One afternoon I remembered something—not because it mattered, but because it was embarrassing: while chasing adjacent-channel interference I found the institute's old VCR running eleven minutes fast. I had set that clock three years ago. I wrote the date on a sticker and stuck it to the machine. Nobody requires this kind of work; you do it and feel a little more settled. The ledger is full of such entries. The real sweep barely takes up lines.
What takes up lines is negation. Satellite: no. Aircraft: no. Radar: no. Microwave oven: no, with the old case cited. Page by page the ledger was coming to read like an alibi—the Earth's alibi. The Earth wasn't there.
I plotted the days of steps on a single chart: seven points on a straight line. It went around the group; nobody said anything. It wasn't the beauty of the straight line. It was what stood behind it: seven days running, the same moment, error under half a second. No machine on Earth keeps time like that and holds its tongue. Things that keep time well all carry papers—GPS has its ephemerides, longwave stations have call signs. This one carried nothing.
Zhou Yansheng came in on the fourth day. He didn't look at people when he entered the meeting room; he looked at the whiteboard, left to right, then right to left. When he was done he said: "Start from the beginning."
I started from the beginning: frequency, bandwidth, steps, bearing. He interrupted once, to ask the integration time. Thirty-seven seconds, I said. He nodded and told me to go on.
When I finished he announced nothing. "Rule out the Earth first," he said. "Rule it out clean. Until the terrestrial causes are dead, no celestial cause stands for a single day." Then he looked at me. "You're the one on nights?"
"I am."
"The night logs get a signature on every page, starting tonight," he said. "When you've cleared item eleven and there's more to clear, come find me."
Adebayo replayed it with me afterward: the old man's two sentences carried two messages. First, he believed this thing would never be cleared clean—he was already thinking about what comes after item eleven. Second, the signatures meant that whatever comes of this later, the stack of paper has to stand up to anybody's audit. I said he was reading too much into it. Adebayo said: bet you a canteen meal, the odds favor me.
He made bets like that all the time. I didn't take this one.
Here is how home went in those days: in at seven thirty in the morning; Nian already fed, schoolbag squared away at the door. On the piano, a fresh note from the teacher: "Twinkle Twinkle" Variations—third variation, the slurs uneven; ten slow runs daily. In the kitchen my mother asked whether I'd be home for dinner; I said maybe; she said oh. That is as far as her questions went—one question, no pressing. That was the rule in my parents' house. My father had been the same. He didn't ask. He sat in front of his radio, turning the shortwave band around and around, settling where no station lived, and listened to the static for a whole afternoon. When I was small I asked what he was listening for. He said: listening for whether anyone's there.
I used to think there was nothing to say back to that. Now it is my profession. Sometimes I think I've picked up the thread. Sometimes I think I picked it up backward.
One day I got off early and caught Nian at practice. She stuck at the third variation again; those two slurred notes always came out one heavy and one light, like someone knocking at a door and finishing only half the knock. She looked over at me. I said slower—slow enough that you can count every note yourself. She pouted through one slow pass, and it came out even. She startled at it herself, then said: "Mama, don't go. Watch me play it ten times." I said okay. On the seventh pass she flubbed the last bar and started over; I didn't stop her. When the tenth pass ended she put her hands on the lid and waited for me to speak. I said: tomorrow, ten more. She said oh—openly unwilling—but peeled the note off herself and moved it, dead center on the music stand. This child keeps her own rules. Who she takes after, I won't say.
I ate at home that night. My mother had stewed pork-rib soup and didn't ask why I'd turned up out of schedule. Nian gave a long account of her class—who had swapped seats with whom, whose tooth had fallen out. Nobody at the table mentioned the signal. Nobody knew there was a signal. I picked up a piece of rib, and it struck me: a dinner like this would not leave one word in the ledger. The ledger records the sky.
The Red Lantern keeps the night shift with me now, parked beside the oscilloscope, shortwave band, hissing. It joined the institute before I did—no. It outranks me outright: built in 1987, thirty-six years on duty, with one stretch of honorable retirement collecting dust on my balcony. Back on active service, more devoted than the new hires—it goes on at dusk and stays on all night.
The afternoon after item eleven, Zhou called the five of us into his office. On his desk stood a thermos. He twisted it twice, couldn't open it, set it down, took it up again a minute later, still couldn't. After that he let it stand with the lid off and poured his water from the mouth of it. Nobody mentioned it. He talked scheduling for forty minutes: nights doubled to two, the ledger in duplicate, paper copies into the cabinet, one cabinet key his and one the duty chief's; the sweep items posted on the wall, and when an item was to be struck off, he struck it himself in red pen—no one else touches the pen. Adebayo asked whether the paper log ought to be numbered like the archives. No, said Zhou; flipping by date is the numbering—and he glanced at the wall calendar as he said it, a very short glance, as if one glance more would make him responsible for it. At the end he left one sentence:
"This signal: from here on, every step gets recorded, every step gets filed. As of today, it gets treated as important."
Ye Zhen came over on loan from the archive group on the sixth day. She arrived pulling a small suitcase; inside, not clothes but case files. Old cases from the archive group, she can take them as she pleases, she said—the rule is paper doesn't leave its cabinet—so she applied to the section head for special approval, photocopied the approval slip, and carries the photocopy too. That was the kind of person she was. Before starting any work she stood in front of the radio for a good while.
"Made in 1970?" she asked.
"'87."
"Oh. A 1970 plate on an '87 set." She pointed at the nameplate below the dial. "This typeface for the two characters of 'Red Lantern'—that's the mid-to-late-eighties revision. Before that it was lettering art." She wasn't looking at us while she said it; she was looking at the plate. "I've cataloged a cabinet of this kind of thing. Household appliances, sorted by maker."
I asked how she came to catalog even this.
"Things that stay unsorted make me ill," she said.
She had one trait in speech: whatever had a source came with its number. At lunch she told the table the sequel to the microwave case: she had pulled the file—1998 paper. "Volume 41, page 117, where the photograph is pasted," she said. "And under the photo, one line in the archivist's hand: 'Verified. Smell acceptable.'" Nobody knew what smell acceptable meant, and she explained: the man sent to take samples at the canteen had stayed for lunch. She was the only one at the table who laughed, and when she'd finished laughing she added: "The annotation is out of compliance. I don't recommend withdrawing it."
On the eighth day Zhou had me write, in a private capacity, to three old classmates at outside stations, the wording kept pale: "We've been doing a routine K-band patrol lately—seen anything narrowband your way? Just asking in passing." No frequency, no steps, no bearing. First find out whether anyone else has seen, he said. Then decide who gets to know we've seen.
All three replies arrived within the day. One said no. One said he'd go look, and reported back the next day: no. The third was a classmate from my graduate years, in the Southern Hemisphere; her reply was a single line: "You tell me first what it is. Then I'll tell you whether we have one."
I answered as instructed: "Just a narrowband interference source. We're chasing the origin."
She didn't reply. Six hours later she sent a screenshot—not my frequency; the second harmonic of the hydrogen line. She had found her own way there. Under the screenshot, one line: "That's our power curve here. Look for yourself. I haven't said a thing."
Her curve matched mine: straight, one step a day.
I set the two charts side by side. One Northern Hemisphere, one Southern, the same moment, the same slope. I called Zhou, didn't say much, sent the charts over. The line stayed quiet for a spell. "Understood," he said. "The list doesn't get any longer." Then, after a beat: "Log this one after item eleven. Title it External Verification."
Only after hanging up did I feel the true weight of "keep the wording pale." If this ever got out, the first thing to be crushed would not be astronomy. It would be wording.
The night of day nine of the sweep was my shift. At five past three I was sitting ready, like waiting for a bus whose schedule only I knew. Adebayo couldn't settle; he hung on until three, moved a chair to another terminal, said he was "in the neighborhood." At three eleven forty-four the signal stepped up onto the twelfth stair. As the curve made its move, both screens in the room flashed the number at once, and nobody said a word. He waited twenty minutes, confirmed there was no second step, stood, put on his jacket, and at the door turned back: "Tomorrow I'll take the first half of your shift for you." I said no need. "I wasn't negotiating." The door closed.
I logged as usual, signed as usual. With the page written, I left the terminal on and pulled up the twelve steps for another look. One more point on the straight line; still straight. I messaged Zhou: Twelfth step, logged. He replied: Received.
About ten minutes later another message came, one line only:
"Either somebody is playing a prank, or else it's history."
I looked at the line for a while. No moon outside; the mountain black. The Red Lantern hissed on at the corner of the desk. I reached over and turned the volume up one notch. Still static. Nothing in it—and everything in it.
I wrote back: tomorrow, keep eliminating.
He didn't write back.