For seven years, Yanagi had done the same thing at Halley Station, a cargo relay post on the outer edge of the solar system. Ice samples harvested from incoming comets, forwarded to research institutions on Earth. Pack them, label them, load them into the launch tube. That was it.
Comets carry the original chemistry of the solar system, locked in ice since the very beginning. Priceless to scientists. To Yanagi, they were cold rocks. Three deliveries a week, three shipments out. Nobody thanked him. Researchers cared about what was inside the samples, not whose hands had sealed the box.
He’d taken the job to get away from Earth. He applied the month after his divorce settlement wrapped up. In the reason box on the application, he wrote “interested in space.” The interviewer didn’t laugh. Probably seen enough people with the same answer.
One day, a package arrived that wasn’t on the scheduled manifest.
The sender field was blank. The recipient: “Halley Station — Cargo Officer.” Yanagi was the only one. It weighed around four hundred grams. When he shook it, something shifted inside — not liquid, solid, rolling around in cushioning material.
He opened it.
A thumb-sized stone in a clear resin case. Pale, with faint streaks of blue. Not like the comet ice he handled every day — harder, more crystalline, with thin veins running through the interior.
The enclosed note had a single line.
“This is the remaining half of the first sample you packaged seven years ago.”
Yanagi tilted his head. The first sample, seven years ago. He had no memory of it. He didn’t keep a log of what he packed on day one.
But on the back of the note was a date and a catalog number. He pulled it up in the database.
Sample HY-0001. Source: comet C/2019 K4. Collection date: three hours before Yanagi reported for duty. His predecessor had harvested it; Yanagi had been the first to pack it. Destination: Planetary Science Lab, University of Tokyo.
He traced the lab’s records. The sample had arrived safely, been analyzed, become a paper. A discovery about the composition of water in the early solar system. Over two hundred citations.
At the end of the acknowledgments, one line.
“The authors thank Yanagi Kenji of Halley Station Cargo for his careful handling of the samples.”
Yanagi read the screen twice. He had never once, in seven years, seen a paper with his name in it.
He read the note again. No sender. But whoever held “the other half” of that sample could only be the collection team or the lab that had analyzed it.
He took the stone out of its case and set it in his palm. Cold. Four and a half billion years of cold, he thought — from when the comet had been frozen at the far edge of the solar system.
He set the stone on his desk. Then, for the first time in a long while, he switched on the label printer. One label came out.
Recipient: Planetary Science Lab, University of Tokyo. Sender: Yanagi Kenji. In the contents field, he wrote one word: Reply.
He hadn’t decided yet what to send. But he knew, with complete certainty, that he had something to send back.
On his desk, the stone caught the station’s light and glowed blue — the same color as a comet’s ion tail.