The Ringworld Engineers

Epilogue

One falan later: ten Ringworld rotations.

Far up the arc of the Ringworld, twenty-one candle flames glowed brightly, as brightly as the corona of the hyperactive sun showing around the edges of a shadow square.

Needle was still embedded in basalt beneath the Map of Mars. Needle’s crew watched in a hologram window, courtesy of the probe’s cameras. The probe had been brought to rest at the cliff edge of the Map of Mars, on carbon dioxide snow, where martians were not likely to tamper with it.

Between those two rows of candle flames, plants and animals and people would be dying. In numbers that would make human space look empty, the plants would be withering or growing strangely. Insects and animals would breed, but not according to their kind. Valavirgillin would be wondering why her father had died and why she was throwing up so often and whether it was part of the general doom and what was the Star People man doing about it all?

But none of that showed from fifty-seven million miles away. They saw only the flames of the Bussard ramjets burning enriched fuel.

“I am pleased to announce,” the Hindmost said, “that the center of mass of the Ringworld is moving back toward the sun. In another six or seven rotations we can set the meteor defense as we found it, to fire on meteors. Five percent of attitude jet efficiency will be enough to hold the structure in place.”

Chmeee grunted in satisfaction. Louis and the City Builders continued to awe into the hologram glowing in a depth of black basalt.

“We have won,” the Hindmost said. “Louis, you set me a task whose magnitude compares only to the building of the Ringworld itself, and you set my life at stake. I can accept your arrogance now that we have won, but there are limits. I will hear you congratulate me or I will cut off your air.”

“Congratulations,” said Louis Wu.

The woman and boy on either side of him began to cry.

Chmeee snorted. “To the victor belongs the right to gloat, at minimum. Do the dead and dying bother you? Those worth your respect would have volunteered.”

“I didn’t give them the chance. Look, I’m not asking you to be guilt-ridden—”

“Why should I be? I mean no offense, but the dead and dying are all hominids. They are not of your species, Louis, and they are certainly not of mine, nor of the Hindmost’s. I am a hero. I have saved the equivalent of two inhabited worlds, and their populations are of my species, or nearly so.”

“All right, I see your point.”

“And now, with advanced technology to back me, I intend to carve out an empire.”

Louis found himself smiling. “Sure, why not? On the Map of Kzin.”

“I thought of that. I believe I prefer the Map of Earth. Teela told us that kzinti explorers rule the Map of Earth. In spirit they may resemble my world-conquering people more nearly than the decadents of the Map of Kzin.”

“You know, you’re probably right.”

“Furthermore, they of the Map of Earth have fulfilled an ancient daydream of my people.”

“Oh?”

“Conquering Earth, you idiot.”

It had been long since Louis Wu laughed. Conquering plains apes! “Sic transit gloria mundi. How do you plan to get there?”

“It should be no great feat to free Needle and guide it back to Mons Olympus—”

“My ship,” the Hindmost said gently, but his voice cut through Chmeee’s. “My controls. Needle goes where I will it.”

An edge in Chmeee’s voice. “And where might that be?”

“Nowhere. I feel no strong urge to justify myself,” the Hindmost said. “You are not my species, and how can you harm me? Will you burn out my hyperdrive motor again? Yet you are allies. I will explain.”

Chmeee was up against the forward wall, giving the puppeteer his full attention. Claws extended. Fur fluffed around his neck. Naturally.

“I have violated tradition,” said the Hindmost. “I have continued to function when death might touch me at any second. My life has been at stake for nearly two decades, with the risk rising almost asymptotically. The risk is over, and I am exiled, but I live. I want to rest. Can you empathize with my need to take a long rest? In Needle I have as many of the comforts of home as I will ever see. My ship is safely buried in rock, between two layers of scrith, which compares in strength to Needle’s own hull. I have quiet and safety. If later I feel the need to explore, a billion cubic miles of the Ringworld Repair Center is just outside. I am just where I want to be, and I will stay.”

Louis and Harkabeeparolyn did rishathra that night. (No: they made love.) They hadn’t done that in some time. Louis had feared that the urge was gone. Afterward she told him.

“I have mated with Kawaresksenjajok.”

He’d noticed. But she meant permanently, didn’t she? “Congratulations.”

“This is not the place to raise a child.” She had not bothered to say I’m pregnant. Of course she was pregnant.

“There must be City Builders all over the Ringworld. You could settle anywhere. In fact, I’d like to come with you,” Louis said. “We saved the world. We’ll all be heroes, assuming anyone believes us.”

“But, Louis, we can’t leave! We can’t even breathe on the surface, our pressure suits are in shreds, and we are in the middle of the Great Ocean!”

“Were not desperate,” said Louis. “You talk as if we’d been left naked between the Clouds of Magellan. Needle isn’t our only transportation. There are thousands of those floating discs. There’s a spacecraft so big that the Hindmost could pick out the details on deep-radar. We’ll find something in between.”

“Will your two-headed ally try to stop us?”

“Contrariwise. Hindmost, are you listening?”

The ceiling said, “Yes,” and Harkabeeparolyn jumped.

Louis said, “You’re in the safest place imaginable on the Ringworld. You said so yourself. The most unpredictable threat you face has to be the aliens aboard your own ship. How would you like to get rid of us?”

“I would. I have suggestions. Shall I wake Chmeee?”

“No, we’ll talk tomorrow.”

Just at the cliff edge was where the water began to condense. From there it streamed downward. It became a vertical river, a waterfall twenty miles tall. The bottom was a sea of mist reaching hundreds of miles out to sea.

The probe camera that looked down the side of the Map of Mars showed them nothing but falling water and white mist.

“But in infrared light the picture is different,” the Hindmost said. “Observe.”

The mist hid a ship. A narrow triangle of a ship, oddly designed. No masts. Just a second, thought Louis. Twenty miles down… ”That thing must be a full mile long!”

“Nearly that,” the Hindmost agreed. “Teela told us she had stolen a kzinti colony vessel.”

“Okay.” Louis had already decided, that quick.

“I detached an intact deuterium filter from the probe Teela later destroyed,” the Hindmost said. “I can fuel that ship. Teela’s journey was grueling, but yours need not be. You may take floating discs for exploring, and for trade goods when you reach shore.”

“Good idea.”

“Will you want a working droud?”

“Don’t ever ask me that again, okay?”

“Okay. Your answer is evasive.”

“Right. Can you dismount a pair of stepping discs from Needle and install them in the ship? It’d give us something to fall back on if we hit real trouble.” He saw the puppeteer eye to eye with himself, and he added, “It could save your life. There’s still a protector and he won’t have to leave the Ringworld now, thanks to us.”

“I can do that,” the Hindmost said. “Well, is this an adequate means to reach the mainland?”

Chmeee said, “Yes. A long voyage… a hundred-thousand-mile journey. Louis, your people suppose a sea voyage to be restful.”

“On this sea, it’s more likely to be entertaining. We wouldn’t have to head straight to spinward. There’s the Map of an unknown world to antispinward, and it’s less than twice as far.” Louis smiled at the City Builders. “Kawaresksenjajok, Harkabeeparolyn, shall we check out some legends for ourselves? And maybe make a few.”

Glossary

ANTISPINWARD: Direction opposite to the Ringworld’s direction of spin.

ARCH: The Ringworld as seen from the surface. Some natives believe their world is a flat surface surmounted by a narrow parabolic arch.

ARM: The United Nations police. Jurisdiction is limited to Earth-Moon system.

BELTER: Citizen of the asteroid belt, Sol system.

CONTROL CENTER: See REPAIR CENTER.

CZILTANG BRONE: A City Builder device, a beamer that allows solid objects, freight, passengers, etc., to penetrate scrith.

DROUD: A small device that plugs into the skull of a current addict. Its purpose: to meter the current flow to the pleasure center of the addict’s brain.

EYE STORM: The pattern of winds that form around a meteor puncture in the Ringworld floor.

ELBOW ROOT: Ringworld plant grown for fences.

FLEET OF WORLDS: The five puppeteer planets.

FLYCYCLE: Single-seater vehicle used for exploration on the first Ringworld expedition.

FLUP: Seabottom ooze.

FOOCH (FOOCHESTH): Stone couches set throughout the kzinti hunting parks.

HUMAN SPACE: The cluster of stellar systems inhabited by mankind.

KNOWN SPACE: The stellar region known to humanity through the explorations of human or other species.

LANDER: General term for a ground-to-orbit craft.

LONG SHOT: See QUANTUM II HYPERDRIVE.

MAKE HIS (HER) DAY: Use a tasp on him (her), especially from concealment.

OUTSIDER: Intelligent life form whose biochemistry is based on liquid helium and the thermoelectric effect. Outsider ships roam the stars at sublight speeds, trading in information.

OUTSIDER HYPERDRIVE: Faster-than-light drive never used by the Outsiders themselves, but used extensively by the star-traveling species of known space.

PORT: To the left as one faces spinward.

QUANTUM II HYPERDRIVE: Developed by Pierson’s puppeteers, a mode of travel [that] is enormously faster than the Outsider hyperdrive. Long Shot was the prototype spacecraft, the first to visit the galactic core.

REPAIR CENTER: (Hypothetical) Center of Ringworld maintenance and controls.

RISHATHRA: Sex practices outside of one’s own species (but within the hominids).

SCRITH: Ringworld structural material. Scrith underlies all of the terraformed and contoured inner surface of the Ringworld. The rim walls are also of scrith. Very dense, with a tensile strength on the order of the force that holds atomic nuclei together.

STEPPING DISKS: Teleportation system used on the Fleet of Worlds. (Other known races use a less sophisticated method, the enclosed transfer booths.)

SPILL MOUNTAINS: Mountains standing against the rim wall. They have their own ecology. One stage in the circulation of flup.

SPAGHETTI PLANT: Ringworld plant, description obvious. Edible.

SPINWARD: In the direction of rotation of the Ringworld.

STARBOARD: To the right as one faces spinward.

STASIS: A condition in which time passes very slowly. Ratios can be as high as half a billion years of real time to a few seconds in stasis. An object in stasis is very nearly invulnerable.

TANJ: Slang acronym formed from “There Ain’t No Justice.” Used as an expletive.

TASP: A hand-held device to tickle the pleasure center of a human brain from a distance.

TERRAFORM: Operate on an environment to render it Earthlike.

THRUSTER: Reactionless drive; has generally replaced fusion rockets on all spacecraft save warcraft.

WEENIE PLANT: Ringworld plant similar to melons or cucumbers, but growing in links. Clusters of roots spring from the nodes. Grows in damp areas. Edible.

Ringworld Parameters

30 hours = 1 Ringworld day

1 turn = 7.5 days = A Ringworld rotation

75 days = 10 turns = 1 falan

Mass = 2 X 10^30 grams

Radius= .95 X 10^8 miles

Circumference = 5.97 X 10^8 miles

Width = 997,000 miles

Surface area = 6 X 10^14 square miles = 3 X 10^6 times the surface area of Earth (approx.)

Surface gravity = 31 feet/second/second = .992 G

Rim walls rise inward, 1000 miles high.

Star: G3 verging on G2, barely smaller and cooler than Sol

About The Author

Larry Niven is one of today’s leading science-fiction authors, recognized particularly for his mercurial scientific imagination as exercised in his “Tales of Known Space,” short story fiction published in several collections, and the prize-winning novel, Ringworld. His other recent books include the mainstream bestseller, Lucifer’s Hammer, written with Jerry Pournelle.