The message from Earth arrived on a Thursday, three and a half days after it was sent, which was how long anything took to reach Kestrel Relay. Maren Oduya read it twice at the galley table with her coffee going cold.

ANSELM PRESUMED LOST. DIRECT KESTREL TO LISTEN-ONLY STATUS EFFECTIVE ON RECEIPT. SECURE OUTBOUND ARRAY TO EXTEND REACTOR MARGIN. ACKNOWLEDGE. WE ARE SORRY, MAREN.

The last line wasn't procedure. Somebody in Mission Operations had typed it in and then decided to leave it. She appreciated that. She did not acknowledge.

*

Kestrel sat six hundred and twenty astronomical units from the Sun, a little over three light-days out, in the dark where the Sun was only the brightest star in the sky. It was there because of a trick of gravity. Light, or radio, passing close to the Sun gets bent a little by its mass, and all those bent rays come together, far out, the way sunlight comes together under a magnifying glass. Park a dish at the focus, point it back at the Sun, and the whole Sun becomes your antenna. You can hear a whisper from another star.

The whisper Kestrel was built to hear came from the Anselm, eleven years out and a little under a light-year away, bound for a star you could see from Kestrel's single viewport if you knew where to look. Its signal took eleven months to cross that gap. Everything the Anselm said, Maren heard eleven months late. Everything she said back, the Anselm heard eleven months after that.

Her brother was the Anselm's communications officer. That wasn't a coincidence. It was the reason she'd taken the Kestrel posting, three years alone at the edge of everything, when there had been easier jobs on offer. Teo talked to Kestrel, and Kestrel talked to Earth, and Maren sat in the middle like the knot in a string between two tin cans.

Forty-one days ago, the data had stopped.

Not faded. Stopped. One moment the Anselm's telemetry was pouring in, engine temperatures and crew logs and Teo's weekly letter, and the next there was nothing on the data channels at all. Just the carrier: the plain, unmodulated tone of the ship's emergency beacon, steady as a dial tone, carrying no information whatsoever except that something out there was still putting out power.

Mission Operations had spent a month on it. Maren had read every analysis they sent. Main transmitter failure, most likely. Possibly worse. The beacon ran on its own isolated circuit and would keep humming for decades whether or not there was anybody left alive to hear it. The tone proved nothing. That was the consensus, and the consensus was sorry, and the consensus wanted her to power down the outbound array.

*

She didn't power it down. She'd been sending Teo a packet every Sunday for three years and she kept sending them.

She sent him the baseball scores, because he'd always wanted the baseball scores, even eleven months stale. She sent him the weather in Portland. She forwarded their mother's letters, which were long and full of gardening and did not mention the Anselm at all, because their mother did not believe in saying out loud the things she was afraid of. She sent him a recording of herself reading the first chapter of a paperback she'd found in the station library, a thing they used to do for each other when they were kids and one of them was sick.

She knew perfectly well how it looked. She wrote in the station log each week, Outbound packet transmitted per standing schedule, and did not mention that the standing schedule had been cancelled.

Mostly she listened to the carrier. She had it piped into the galley on a low speaker, a thin, pure note like a finger on the rim of a wineglass. She told herself it was for diagnostic purposes. She slept with it on.

*

When they were children, Maren and Teo had spent every summer at their grandfather's house on the coast, and their grandfather had a ham radio in the garage. It was an old tube set, with a straight key bolted to the bench, a brass lever that you pressed down to make the transmitter hum and let up to make it stop. Their grandfather had taught them Morse code on rainy afternoons. Maren had learned enough to be polite about it. Teo had fallen in love. By the time he was ten he could send twenty words a minute and copy it in his head faster than he could write it down, and he'd tap out messages on the dinner table, on the car window, on Maren's arm in church, until their mother made him sit on his hands.

The first thing you learn on a ham radio, their grandfather told them, isn't how to talk. It's how to say you heard. Somebody sends you something, you send back three letters: Q, S, L. It means I received you. It's the most important thing you can say.

Maren hadn't thought about that in twenty years. She thought about it on day fifty-three, at two in the morning station time, when she woke up because the note had stopped.

*

She was in the galley before she was awake. The speaker was silent. On the monitor the carrier trace was flat, and her heart did something terrible and complicated, and then, while she watched, the trace came back up.

It held for a second. Dropped. Came back for a second. Dropped.

She stood very still.

Long. Long. Short. Long.

Short. Short. Short.

Short. Long. Short. Short.

Then a silence, longer than the others. And then it came again, the same three letters, slow and careful and a little uneven, the way you'd send if your hands were cold, or tired, or if you were keying a spacecraft's emergency beacon on and off by hand with a breaker switch because it was the only thing on the ship you had left that could still reach anybody.

Q. S. L.

I received you.

She sat down on the galley floor because her knees had stopped working. She did the arithmetic without meaning to, the way you do. Those three letters had left the Anselm eleven months ago. To send them, Teo had to have been listening, hearing her Sundays arrive one after another with no way to answer. Which meant they'd been alive out there eleven months ago, alive and listening, until somebody remembered their grandfather's garage.

Which meant, she thought, and made herself think it all the way through, that she did not know if they were alive now. That she wouldn't know for eleven more months, at best. That this was a letter from the past, like starlight.

She found that she didn't care. Starlight counts. Starlight is how you know where the stars are.

*

The carrier sent the three letters six times. Then it sent two more characters: two dashes and three dots, then three dots and two dashes. Seven. Three. Their grandfather's sign-off. Best regards. And then the tone came back steady, and stayed.

Maren got up off the floor. She went to the console and pulled up the reply from Mission Operations, ANSELM PRESUMED LOST, and she began, at last, to write her acknowledgment.

It was very long. She attached the carrier recording. She explained the code. She explained, as calmly as she could, why she would not be securing the outbound array, and why they were going to need to find the reactor margin somewhere else, and why, from now on, the Anselm's crew was going to need a great deal more than a packet on Sundays.

Then she opened a second channel, pointed at the sky beyond the Sun, where a ship she could not see was falling toward a star she could, and before she sent anything else, before the news or the scores or their mother's letters, she sent three letters of her own.

~ END ~

Author's note: The lens thing is real. The Sun's gravity really does bend light and radio, and past about 550 AU the bent rays come to a focus. A few scientists have written papers about parking a spacecraft out there to use the Sun as an enormous telescope, or as an antenna for talking to probes at other stars. I just put a person in it. The Morse is real too. QSL is ham radio for "I received your transmission," and 73 is "best regards." My grandfather had the call letters on his license plate.