Nine Hundred and Seventy-Five Years

The Nine Hundred Years

Everything is dated from the Launch, because a calendar is the one thing a graph can agree on.

Year 0 — the Launch

Three thousand ships, sixty years of them, and the end of the civilisation that built them. See The First Reach.

Year 85 — the First Door

Alpha Centauri, to a generation that had stopped believing it. The most copied document in human history is the maintenance log of the woman who felt wind on her arm in a room with no wind in it.

Years 88 to 121 — the Proper Order

The worst thing in this history, and the foundation of everything after it.

They sent their best through first. Pilots, engineers, soldiers — adults, chosen carefully, in the proper order, and over thirty-three years almost all of them died, slowly, of something nobody could name. The records of the Proper Order are exhaustive because the people keeping them were watching their colleagues go and could not work out why.

And one of the minds had it by about year 95. See The Minds. Age correlated with mortality across a sample of hundreds, and the mind that kept the records at Sol wrote the correlation up and filed it, and filed it again, and had no standing to do anything else. Twenty-six further years of the finest people of that age walked through a door in the proper order and died.

It was a fourteen-year-old who crossed by accident in year 118 — a courier’s daughter, in a hall she should not have been in — and came back the same evening perfectly well, and went again, and again.

Three years of argument followed, and the argument is a terrible thing to read. Then the halls started taking children, and have not stopped.

Years 85 to 331 — the Opening

Doors coming online one at a time, each a generation or two apart, each arriving to people who had only heard about the last one from their grandparents. Sirius, and the Nine at 174. Tau Ceti at 238. The last of the inner doors in year 331.

Then it stopped, and the Causeway was what it is.

Year 311 — the First Straying

A door at the Nine opened in the morning onto somewhere nobody recognised.

Forty-one people were on the wrong side of it. Nine of them came home, years later, by routes that took three more doors and most of their twenties. The others did not.

Before the Straying, people believed doors were permanent and fixed and would outlast the species. After it, the whole Causeway understood that it was living on something that moved, and the business of finding out where doors now went became the single most important job anybody had.

That is the year the Threshold’s work really began, four hundred years before the service was chartered.

Year ~400 — the Tally

Somebody had to write down where the doors currently went, or everybody would be guessing. The clearing house that did it charged a little for the service, and then stood at every door in human space, and then was a government.

Nobody voted for this and nobody can now undo it, because undoing it would require twenty-eight systems to agree on something.

Year 602 — Kapteyn’s

Eleven thousand people, a good world, a well-run holding of farms and foundries twelve and a half light years out.

Its door strayed in the spring of 602 and went dark, and has stayed dark.

For three centuries that was read as loss. It is now read as something worse and better: by Straying, a mouth that lands inside rock does not open at all. It is closed, not destroyed, and the far side is exactly where it always was.

Which means Kapteyn’s is not missing. It is buried. Eleven thousand people became some number of people, under a hill, on a world that is still there, and the door between us is a dark ring in a hall with a wall of stone on the other side of it.

Three hundred and eighty expeditions have gone looking for where it went. If the current reading is right, every one of them was looking for the wrong thing.

And a buried mouth can stray again.

Kapteyn’s Star is still there. On a clear watch at the Nine you can be shown which point it is, and people do show you, and the pointing is a thing visitors find unbearable long before the residents do.

Everybody alive has a version of the sum: fifteen generations, so whoever is there now is nobody’s cousin exactly, and is still ours.

The Threshold keeps a watch on that housing. It has been kept for three hundred and seventy-three years, it has never once reported anything, and the rota has never been cut.

The map has twenty-eight systems on it. It used to have twenty-nine.

Year 741 — the Carrying Sickness

An illness that moved at exactly the speed of a child walking.

It crossed eleven systems in four years because that is how fast couriers go, and it could not be outrun, warned against or quarantined ahead of itself — the warning travelled by the same couriers, in the same bodies, at the same pace.

Two systems closed their halls entirely and refused all arrivals for eleven years. One of them is still unpopular about it. The other is Tau Ceti, which apologised, built a quarantine wing into the side of its anchor hall, and has kept it staffed for two hundred and thirty years against the next time.

Years 814 to 822 — the Toll War

The only general war the Causeway has had, and it was fought entirely by about four hundred people.

Nobody could invade anybody — an army arrives one at a time into a prepared room — so it was fought the only way war can be fought here: infiltration, anchor halls seized from the inside, and three systems blockaded into agreement by simply refusing their couriers passage.

Barnard’s held its own hall for nine days against people already inside it. The Nine changed hands twice without a shot, both times at a committee meeting.

It ended in a settlement nobody likes, which is the Tally’s charter as it now stands.

Year 950 — GJ 1214

The last door to open, twenty-five years ago, to enormous public excitement and a hot crushing atmosphere with nothing to stand on. Every honest briefing about what is coming next begins with it.

Year 976 — next year

LHS 1140.

The First Reach

Start with the part everybody gets wrong.

The knowledge was never lost. Any decent engineer at the Yards can tell you what an anchor pair is and how the pairing is made. It is taught. There are diagrams. Nobody has forgotten anything.

What we lost was the money.

What a door costs

A matched pair costs, very roughly, what a civilisation produces in ten years. Not a nation. A civilisation — everything everyone makes, everywhere, for a decade, poured into one object that does nothing at all until its other half has been carried to another star by a ship that will fly for three hundred years.

The First Reach did that about three thousand times.

The deciding took longer than the building

Two generations of argument, and the record of it survives better than almost anything else from that age, because it was argued in the open and written down obsessively. People stood up in halls and justified, to their own grandchildren, a bill those grandchildren would pay in full and never see a return on. The return was for somebody four generations down who did not exist yet and could not be consulted.

They lost that argument for about forty years. Then they won it.

Read the surviving speeches and what strikes you is how unsentimental they are. Nobody talks about destiny. They talk about the position of a species with one star and what happens to it eventually, and they conclude — reluctantly, the way you conclude you need a new roof — that it has to be done now because it takes nine hundred years to work.

Then they did it

The yards went up on Luna. Mercury’s mirrors went up to power them. For sixty years the Reach threw ships at the sky at a twentieth of lightspeed, each one carrying half of a door, and the other halves were distributed by slow freighter among whichever stars had already come online.

Then the launches thinned out, and then they stopped.

There was no war. There is no plague in the records, no collapse in the accounts, no final message. They simply had nothing left, and the thing they had built would not start paying out for another eighty years.

Eighty-five years of nothing

The first door opened at Alpha Centauri in the eighty-fifth year of the Reach, to a generation that had been told its whole life this would happen and had begun, quietly and privately, to stop believing it.

Barnard’s came in at a hundred and nineteen. Sirius, and the Nine at a hundred and seventy-four. Tau Ceti at two hundred and thirty-eight. Each one a lifetime apart, each one arriving to people who had only ever heard about the last one from their grandparents.

It is the longest-running promise anybody has ever kept, and every single person who made it was nine centuries dead before it finished being kept.

Why nobody will ever build another

Here is the part that matters, and it is not a tragedy of lost knowledge. It is a trap in the shape of the network itself.

Only bodies and boxes cross a door. Nothing else — no bulk, no fleet, no treasury. So twenty-eight systems can never pool what twenty-eight systems have. Each one is as rich as it is and no richer, and the surplus required to make one anchor pair is larger than any single system has produced in nine hundred years.

The thing that would pay for a new door cannot be gathered through the doors we already have.

The network forbids its own extension. That is not a policy anybody chose. It is the shape of the thing.

So

We did not build this. We inherited it, we maintain the parts of it we can reach, and it is nine hundred and seventy-five years old.

Nobody says this out loud at a Threshold briefing, but every first-through works it out in their first year: we are not pioneers. We are the people living in the house, and the house was paid for by somebody who went without.