Larry Niven - Ringworld 4 - Ringworld's Children.pdf - Larry Niven - margozap

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Ringworld's Children

Larry Niven

This is for the firemen of California and neighboring states who fought the fires of October 2003, with

particular thanks to those who saved our house and others in Indian Falls, Chatsworth, Los Angeles

County.

PREFACE

The Ringworld is about the same mass as Jupiter. Its shape is that of a ribbon a million miles across and

six hundred million miles long, which makes it a bit larger than the Earth's orbit, and a few miles thick. It

circles a yellow dwarf star. Its spin, at 770 miles/second, is enough to give it about Earth's gravity of

centrifugal force. Walls along both rims, standing a thousand miles high, are enough to hold an

atmosphere for millions of years.

Much else derives from these basic assumptions.

The inner surface is a habitat three million times the area of planet Earth. The topography is literally a

work of art, carved in by whoever built the thing, so that from underneath the Ringworld resembles the

back of a mask.

An inner ring of shadow squares block the sun, giving periods of night; else it would always be noon. A

system of pipes leads from the bottoms of oceans, under the Ringworld floor, up the back of the rim wall

and over the edge, to recycle seabottom ooze (or flup) into spill mountains. Huge attitude jets stand atop

the rim wall, Bussard ramjets using the solar wind of protons for their fuel, to hold the Ringworld against

its inherent instability. There are spaceport ledges outside the walls. Two vast salt oceans serve as

preserves for seagoing life, and as something more: maps of several worlds at one-to-one scale. The

Ringworld floor is of unnaturally strong material, dubbed scrith, with other unusual properties.

The sun itself is involved in the Ringworld's meteor defense. A superconducting network embedded in the

Ringworld floor generates a superthermal laser effect in a solar flare. The drawback: it can't fire through

the Ringworld itself. Thus any meteorite that strikes the Ringworld, such as the one that made Fist-of-God

Mountain, generally rams upward from underneath.

Some details become clues to the nature of the Builders.

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The plethora of harbors and fjords, plus the shallow oceans (most of them), suggest a race that uses only

the top of an ocean.

The nastier life forms--mosquitoes, flies, jackals, sharks, vampire bats--don't exist. Hominids have moved

into some of those ecological slots. The Engineers weren't ecologists, they were gardeners.

The inhabitants are hominids in bewildering variety, some intelligent, some not. They fill ecological

niches which on Earth are held by almost any mammal, but particularly the nastier life forms, jackals and

wolves and vampire bats ... as if mankind's ancestor, Homo habilis, had been protected until they

numbered hundreds of billions, then abandoned to mutate endlessly.

You don't know the Ringworld until you've grasped its size.

After the book came out, a friend was going to build a scale model for an upcoming convention. He had a

marble, a blue immy, to serve as the Earth, for scale. Turns out he'd need a ribbon five feet tall and half a

mile long. The hotel wasn't big enough.

One guy who tried to map the Ringworld told me he ran out of computer space very rapidly. He ran into

too many powers of ten.

David Gerrold speaks of a class of novel called "the Enormous Big Thing." Today you could fill a fair-

sized shelf with them. Arthur C. Clarke's Rendezvous with Rama and Bob Shaw's Orbitsville are in that

class, and so is my own Rainbow Mars.

But Ringworld came first, published in 1970.

It might have been laughed at. Too big, too improbable. Any normal structural material would be torn

apart by its spin. I waited for the reviews in some fear.

James Blish wrote that he thought it would win the Hugo Award, but it shouldn't.

The readers gave it a Hugo Award anyway.

The writers gave it a Nebula.

I didn't have a sequel planned. I was not expecting a flood of redesigns.

During one of my speeches, a man pointed out that the Ring-world's mathematics are simple: it's a

suspension bridge with no endpoints.

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An academic in England pointed out that the tensile strength of the Ringworld frame must be

approximately the force that holds an atomic nucleus together. (Hence, scrith.)

A grade school class in Florida spent a semester on the Ringworld. Their conclusion: the worst problem is

that, without tectonic activity, all the topsoil would flow into the oceans in a few thousand years. (Hence,

flup and the spillpipes.)

At the 1970 World Science Fiction Convention there were MIT students in the halls chanting, "The

Ringworld is unstable! The Ringworld is unstable!" (Did the best that I was able... hence, attitude jets.)

Somebody decided that the shadow squares shed too much twilight. What's needed is five long shadow

squares orbiting retrograde.

Ultimately there was too much opportunity for redesign. I had to write The Ringworld Engineers.

All of these readers had found something worth knowing. The Ringworld is a great, gaudy, intellectual

toy, a playground with the gates left wide open.

Some readers just read a book and stop.

Others play with the characters, or the assumptions, or the environment. They make up their own

homework. We readers have been doing that for unguessable thousands of years: demanding more data on

Atlantis from Plato, inventing Purgatory to put between Hell and Heaven, redesigning Dante's Inferno,

writing new Odysseys. An amazing subculture has sprung up around Star Trek.

The Internet opens a whole new metaplayground for such people. A number of Web sites have sprung up

(well, at least two) whose topic is Larry Niven's fiction.

In September 1999, tipped off by my lovely agent, Eleanor Wood, I logged onto larryniven-

1@bucknell.edu. They were arguing about whether you can clone a protector, and whether Seeker and

Teela Brown might have left a child behind. If they'd been right I wouldn't have seen a story, but they

were off on the wrong foot, and I could fix it. After a few months of following these discussions, rarely

interrupting, I had enough material for Ringworld's Children.

This is a playground for the mind. It's a puzzle too, a maze. Question every turn or you'll get lost. When

you've finished the book, remember not to lock the gate.

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"All this was indispensably necessary," replied the one-eyed doctor, "for private misfortunes are public

benefits, so that the more private misfortunes there are, the greater is the general good."

--Pangloss, in Candide, by Voltaire

RINGWORLD PARAMETERS

30 hours = one Ringworld day

1 Ringworld rotation = 7½ days

75 days = 10 turns = 1 falan

Mass = 2 x l0exp30 grams

Radius = .95 x l0exp8 miles

Circumference = 6 x l0exp8 miles

Width = .997 x l0exp6 miles

Surface area = 6 x l0exp14 square miles = 3 million times the surface area of the Earth

Surface gravity = .992 G (spin)

Spin velocity = 770 miles/second

Rim walls rise inward, 1000 miles.

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

CAST OF CHARACTERS

Recent arrivals

Louis Wu: Earth born. First and second Ringworld expeditions.

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Teela Brown: Earth born, of a line bred for luck by Pierson's puppeteer manipulation. Turned protector in

The Ringworld Engineers, and now deceased. First Ringworld expedition.

Nessus: Pierson's puppeteer, the Hindmost's partner and mate. Led the first Ringworld expedition.

The Hindmost: Pierson's puppeteer, once Chief-in-Command of his species. Led the second Ringworld

expedition.

Chmeee, once Speaker-to-Animals: Kzin. First and second Ringworld expeditions.

Roxanny Gauthier: Earth born, Detective-One in the ARM. Served aboard Snail Darter and Gray Nurse.

Oliver Forrestier: Wunderland born, Detective, ARM. Served aboard Snail Darter and Gray Nurse.

Claus Raschid: Earth born, Detective-Two, ARM. Served aboard Snail Darter and Gray Nurse.

Detective-Major Schmidt: Earth born. Served aboard Gray Nurse.

Wes Carlton Wu: Earth born, Flight Captain aboard Koala.

Tanya Haynes Wu, Earth born, Purser aboard Koala.

Ringworld's children

Seeker: species unknown, last seen with Teela Brown.

Acolyte: Kzin, Chmeee's exiled son.

Bram: Vampire turned protector, ruler of the Repair Center for countless aeons until killed by Tunesmith

with Louis Wu's help.

Wembleth: species unknown, Ringworld-born traveler.

Tunesmith: Night Person (Ghoul) turned protector.

Kazarp: Night Person, Tunesmith's son.

Hanuman: Hanging Person turned protector.

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Larry Niven - Ringworld 4 - Ringworld's Children.pdf

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