Cradle by Arthur Clarke

The biggest surprise in the discussion with Dale had come when Carol, in passing, had praised the way the new alarm algorithm had worked. Dale suddenly had become very interested. “So the alert code definitely read 101?” he had said.

“Yes,” she had answered, “that’s why I wasn’t that astonished when we found the object.”

“No way,” he had said emphatically. “The trident could not have caused the alert code. Even if it was at the edge of the field of view of the telescope, and that seems unlikely given how far you followed the trench, it’s too small to trigger the foreign object alarm. And how could it have been seen under the overhang anyway?” Dale had paused for a few seconds. “You didn’t look at any of the infrared images in realtime, did you? Well, we can process them tomorrow and see if we can figure out what triggered the alarm.”

Carol felt strangely defeated as she opened the door to her motel room. It’s just fatigue, she said to herself, not wanting to admit that her conversation with Dale had made her feel inadequate. She put her briefcase on a chair and walked wearily to the bathroom to wash her face. Two minutes later she was asleep on the bed in her underclothes. Her slacks, blouse, shoes, and socks were all stacked together in the corner.

She is a little girl again in her dream, wearing the blue-and-yellow striped dress that her parents gave her for her seventh birthday. Carol is walking around with her father in the Northridge Mall on a busy Saturday morning. They pass a large candy store. She lets go of his hand and runs into the store and stares through the glass case at all the chocolates. Carol points at some milk chocolate turtles when the big man behind the display case asks her what she wants.

In the dream Carol cannot reach the counter and doesn’t have any money “Where is your mother, little girl?” the candy store man asks. Carol shakes her head and the man repeats the question. She stands on her tiptoes and tells the man in a confidential whisper that her mother drinks too much, but that her father always buys her candy.

The man smiles, but he still won’t give her the chocolates. “And where is your father, little girl?” the candy store man now asks. In the case Carol can see the reflection of a kindly, smiling man standing behind her, framed between two piles of chocolates. She wheels around, expecting to see her father. But the man behind her is not her father. This man’s face is grotesque, disfigured. Frightened, she turns back around to the chocolates. The man in the store is now taking the candy away. It is closing time. Carol starts to cry.

“Where is your father, little girl? Where is your father?” The little girl in the dream is sobbing. She is surrounded by big people, all of them asking questions. She puts her hands over her ears.

“He’s gone,” Carol finally shouts. “He’s gone. He left us and went away and now I’m all alone.”

CYCLE 447

1

AGAINST the deep black background of scattered stars the filaments of the Milky Way Galaxy seem like thin wisps of light added by a master artist. Here, at the far edge of the Outer Shell, near the beginning of what the Colonists call the Gap, there is no suggestion of the teeming activity of the Colony, some twenty-four light millicycles away. An awesome, unbroken quiet is the background for the breathtaking beauty of a black sky studded with twinkling stars.

Suddenly out of the void comes a small interstellar messenger robot. It seeks and finally finds a dark spherical satellite about three miles in diameter that is easily overlooked in the great panorama of the celestial sky. Time passes. A close-up reveals activity on the satellite. Soft artificial lights now illuminate portions of the surface. Automated vehicles are working on the periphery of the object, apparently changing its shape. External structures are dismantled and taken off to a temporary storage area in the distance. At length the original satellite disappears altogether and what is left are two long parallel rails of metal alloy, built in sections of about two hundred yards apiece from the spare parts of the now vanished satellite. Each rail is ten yards across and separated from its matched partner by about a hundred yards.

Regular sorties to the storage area continue until the useful supplies of material are depleted and the tracks extend for a distance of almost ten miles. Then activity stops. The rails from nowhere to nowhere in space stand as mute reminders of some major engineering activity suddenly abandoned. Or was it? From just below a prominent binary pair, the two brightest lights in the eastern sky, a speck emerges. The speck grows until it dominates the eastern quadrant of the sky. A dozen, no, sixteen great interstellar cargo ships with bright, flashing red lights lead a procession of robot vehicles into the region. The ghostly rails to nowhere are surrounded by the new arrivals. The first cargo ship opens and eight small shuttles emerge, each one moving back down the line toward another of the great cargo containers. The shuttles wait silently outside the huge ships while the entourage completes its arrival.

The final vehicle to arrive is a tiny space tug pulling a long, slender object that looks like two folded Japanese fans joined together end to end. It is encased in a transparent and protective sheath of very thin material. Eight small, darting vehicles dance like hummingbirds along its entire length, as if they were somehow guiding it, guarding it, and checking out its health all at the same time.

The large cargo ships shaped like ancient blimps now open and reveal their contents. Most of them are carrying rail sections stacked in enormous piles. The small shuttles unload the sections, leaving them stacked, and set them in groups stretching for miles in both directions from the existing rails. When the rail sections are almost all unloaded, four of the shuttles approach the side of one of the remaining giant cargo ships and wait for the bay doors to swing open. From the inside of this cargo ship come eight machines that attack each of the four shuttles in pairs, breaking them carefully into pieces and taking the parts back into the dark of the cargo bay. A few moments later, an elongated complex of articulating machinery emerges from this great ship. Once released from the confines of the cargo carrier, it stretches itself into a long bench reaching almost a mile in length. Every hundred yards or so along the central platform of this bench, a smaller set of coordinated components form into highly organized local groups.

This is the automated, multipurpose construction system, one of the technological treasures of the Colonists. The entire system moves into place at the end of the tracks and its many remote manipulators begin to pull rail sections from the various stacks. Its sophisticated local hands and fingers deftly put the new sections in place and attach them with atomic welds. The speed is astonishing. An entire mile of new track is finished within minutes and the great builder moves to another group of rail section piles. The completed tracks extend for almost a hundred miles in space.

Having finished with one task, the construction system undergoes its next metamorphosis. Tearing itself into pieces starting from the two ends of the long bench, the monolithic structure disappears and is reorganized into thousands of separate but similar components. These little antlike contraptions attach themselves in groups to individual rail sections. They measure carefully all the dimensions and check all the welds between adjacent sections. Then, as if on cue, the rails on the four ends of the track segments begin to bend and elevate, lifted by the antlike components. The rails twist upward, upward, bringing the rest of the track with them. The two long parallel lines are eventually transformed into a giant double hoop, over ten miles in radius, that looks like an amusement park ferris wheel suspended in space.

With the completion of the double hoop, the construction system again reconfigures itself. Some of the new elements of the system pick up the long slender object shaped like end-to-end Japanese fans. They erect it near the hoop (it is, not surprisingly, almost the exact length as the diameter of the hoops) under the careful surveillance of its hummingbird protectors. Then the object is hoist into place as a north-south spoke in the double hoop structure. Some of the hummingbirds produce unseen thin cables and anchor the spoke to the hoop structure at both ends. The rest of the tiny mechanical speedsters create a web that winds around the center section and connects the great antenna with the east-west axis of the hoops.

The antenna, now connected to its supporting structure, opens slowly at both the north and south pole positions on the hoop. Closer inspection reveals that the hummingbirds are actually pulling the delicate individual folds apart. The folds spread out until the entire interior of the hoops is covered with a mixture of mesh, ribbing, and amazingly complex local arrays. The initial deployment is complete.

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