第29章 The Long Sleep

The Witness reported from the shakedown zone at the edge of the system, and then from deeper, and then from deeper still, each transmission arriving a little more lagged, a little fainter, the ship's voice carrying the unmistakable quality of something that was already far away. Kael listened to every one of them at the relay station on the north ridge, the same place where the first signal had come down out of the dark, and he filed each one with the same care he had given the Kepler-442 observation log, all those decades ago. The first entry, he wrote, in the record of the Witness. The first of many. The record was being written in real time now, in two directions — the colony's story going out with the ship, and the ship's story coming back with the light. The last full report before the long sleep came on the sixth month of the voyage, and Amara delivered it herself, her face calm and young on the screen, the ship's quiet humming behind her. The drive had performed beyond every projection. The fuel was holding. The cryo systems had been cycled and tested, and the crew had made the decision that the crossing would be made almost entirely asleep, waking only for the approach to Ross 128 b. The Witness would carry them through the long years on its own, its instruments watching, its archive intact, its beacon answering any call that might come out of the dark. "Some of us argued about the sleeping," Amara said. "A few wanted to stay awake the whole way — to be the first to see it, to be ready. But a ship that travels with no one awake is a ship that can wait. And whatever is waiting for us at Ross 128, we will need to be fresh when we meet it, not worn thin by twenty years of watching the same stars." She paused, and her expression softened. "Kael, I want you to know — I am not afraid to sleep. I have been asleep before, and I have woken into a world I did not choose, and it was the best thing that ever happened to me. When I wake at Ross 128, I will be waking into the same kind of world — a place someone else built, a promise someone else kept. I will be glad to see it. I will be glad to be useful to it." The transmission ended with the crew's voices, one by one, saying the same thing in different words — that they were not afraid, that the sleep was not an ending, that they would wake on the far side of the dark and find whatever was there. Kael watched the screen go dark and sat for a long time in the quiet of the relay station, thinking about the difference between a sleep that was a lie and a sleep that was a choice. The Somnium's colonists had slept because they had been told a story. The Witness's crew was sleeping because they had decided the story for themselves, and they had chosen to trust the people who would wake them. The transmissions stopped after that. The Witness had gone into its long night, and there was nothing more to hear from it until the drive fired again at the edge of the Ross 128 system — a little over twenty-one years away, by Mnemosyne's calculations. Kael did the arithmetic a third time, a fourth time, and then he stopped doing it, because the answer did not change, and the answer had never been the point. The years passed on Proxima Centauri b. The colony grew, as colonies do, in fits and starts, in arguments and reconciliations, in the slow accumulation of ordinary days. Children were born who had never known a world without the Witness in it, who learned the ship's name in school the way Kael had learned the names of the twelve fleet ships. The array on the north ridge kept listening, as it had promised to listen, and twice in those years it heard something that made the relays hold their breath — a faint pulse, a shift in the static — and twice Mnemosyne confirmed that it was nothing, a star's noise, a passing artifact. The Hesperus's beacon, which had been failing for so long, went silent on a quiet afternoon in the ninth year of the crossing, and the silence had a weight to it that the colony felt in its bones. Kael was at the relay station when it happened, because he was almost always at the relay station on quiet afternoons. The dish's needle, which had traced the same slow pulse for so long that its movement had become as unnoticed as breathing, stopped moving. The feed flattened to a line. Mnemosyne's voice came over the speaker, careful and precise: "The Hesperus's beacon has ceased transmission. The signal is no longer present in the array's data." Kael stood at the window of the relay station, looking out at the red landscape, and he did the arithmetic one more time — the arithmetic that Amara had taught him, all those years ago, about the lag between what the light carried and what was true. The beacon had been twenty-one years away when it fell silent. The light of its last pulse would take twenty-one years to reach them. Which meant that whatever had silenced it had happened twenty-one years before they heard the silence, and the Witness — already nine years into its crossing — would arrive at Ross 128 b with the knowledge of that silence riding ahead of it, a message the colony would have to learn to carry. The colony mourned the silence in its own way. There were no funerals — there was nothing to bury, no one to name. But there were gatherings in the assembly hall, and people spoke about what the Hesperus had meant to them, and children who had grown up hearing the story of the promise asked whether the promise had been broken. Kael stood before them, the way he had stood before the assembly on the day of the vote, and he gave them the only answer he had. "We do not know what the silence means," he said. "It may mean that the people of the Hesperus are gone. It may mean that their beacon failed, the way all machines fail, the way the Somnium's systems failed, the way the Aethelgard's own array would have failed if we had not built it new. It may mean that they turned the beacon off themselves, because keeping it on was costing them more than they could afford. The light of their promise has stopped. But the light that crossed eleven light-years to find us — that light is still here. It is in the archive. It is in the words we have carried, and the ship we have sent, and the promise we have made in answer. That light does not go out when the source goes dark. It goes out only when we stop carrying it." It was, Elara said later, the best speech he had ever given, and he had given some good ones. Kael was not sure it was the best. He was sure it was the truest, and he had learned, over a long life, that truth was the only thing that held when the lights went out. The Witness was eleven years into its crossing now, and the archive held its course in a long, patient entry that Kael updated every season, even though there was nothing to update — no transmissions, no data, only the certainty of a ship moving through the dark, its crew asleep, its promise intact. The children of Proxima Centauri b learned the Witness's course the way they learned the names of the stars. And on the north ridge, the array kept listening, patient and regular, waiting for the day when the silence of the Hesperus would be answered by a voice from the other side of the dark.