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JUPITER V
Moving more and more slowly as she approached the far point of her ellipse, Discovery soared past the orbits of Ganymede and Callisto-but they were out of range on the other side of Jupiter. The ship began to fall back, cutting again across their orbits, as well as those of Europa and Io. She was about to make her first approach to the closest and in some ways oddest of all the satellites, tiny Jupiter V.
Only seventy thousand miles above the turbulent Jovian cloudscape, and completing each orbit in less than twelve hours, Jupiter V is the nearest thing to a natural synchronous satellite in the whole Solar System. For as Jupiter revolves in about ten hours, V stands almost still in its sky, drifting very slowly indeed from east to west.
It was not easy to observe Jupiter V. The tiny moonlet, only a hundred miles in diameter, was so close to Jupiter that it spent much of its time eclipsed in the planet's enormous cone of shadow. And even when it was in the sunlight, it moved so rapidly that it was hard to find and to keep in the field of view.
The fly-by on the mcolored pencil setorning of that second Joveday was not very favorable, the satellite was twenty thousand miles away, and visible only for about ten minutes. There was time for nothing more than a quick look through the telescopes, while the cameras snapped a few hundred shots of the rapidly vanishing little world.
The detailed examination of the photos would take several hours; after a while the endless repetition of impact craters, fractured rocks, and occasional patches of frozen gas produced something close to boredom. But no one could tear himself away from the screen; and at last, after more than half the stored images had been scanned, patience was rewarded.
The crucial sequence had been taken with a telephoto lens, just as Jupiter V was emerging from shadow. At one moment there was a black screen; then, magically, a thin crescent suddenly materialized, as the little moon came out of eclipse.
Kimball was the first to spotcolored pencil set the curious oval patch near the terminator. He froze the picture, and zoomed in for full magnification. As he did so, there were simultaneous gasps from all his colleagues.
Part of the side facing Jupiter had been sheared off flat, as if by a cosmic bulldozer, leaving a perfectly circular plateau several miles across. At its center was a clear-cut, sharply defined rectangle, about five times as long as it was wide, and pitch-black. At first glance it seemed to be a solid object; then they realized that they were staring into shadow; this was an enormous hole or slot, wide enough to engulf Discovery, and extending deep into the heart of Jupiter V. It was at least a quarter of a mile in length, and perhaps a hundred yards wide.
Time and geology could play some odd tricks with a world; but this was not one of them.
It was an unusually quiet and subdued group that gathered in the artificial gravity of the carousel for the luxury of coffee that could actually be drunk from cups, not squirted from plastic bulbs.
The wonder andcolored pencil set the excitement of the discovery had already passed, to be replaced by more somber feelings. What until now had been only a possibility-and, to tell the truth, rather a remote one-had suddenly become an awesome reality. That pyramid on the Moon had been astonishing, but it was only a tiny thing. This was something altogether different-a whole world with a slice carved off, just as one may behead an egg with a knife.
"We're up against a technology," said Bowman soberly, "that makes us look like children building sandcastles on the beach."
"Well," answered Kaminski, "we suspected that from the beginning. Now the big question is-are they still here?"
Jupiter V looked utterly lifeless, but an entire civilization could exist, miles below the surface, at the bottom of that rectangular chasm. The creatures who put TMA-1 on the Moon, three million years ago, could still be going about their mysterious business.
Perhaps they had already observed Discovery, and knew all about this mission. They might be totally uninterested in the primitive spacecraft orbiting at their threshold; or they might be biding their time.
FINAL ORBIT
This was the situation classified in the mission profile as "Evidence of intelligent life-no sign of activity," and the response had been outlined in detail. They would do nothing for ten days except transmit the prime numbers 1 . . . 2 . . . 3 . . . 5 . . . 7 . . . 11 . . . 13 . . . 17, at intervals of two minutes, over a broad band of the radio spectrum. Luckily, the loss of the main antenna complex did not affect this operation; the low-powered equipment on the Control Deck was quite adequate for such short-range work.
They called, and they listened on all possible frequencies; but there was no reply. Though this could indicate many things, it began to seem more and more likely that the tiny moonlet was abandoned. It was hard to believe that it could ever have been anything except a temporary encampment for an expedition-from Jupiter itself, or from the stars?
While they were waiting and watching, and continuing to survey the other four moons whenever the opportunity arose, Bowman prepared for the next step. If it was physically possible, Discovery would make a rendezvous with Jupiter V.
Kaminski spent hours considering approach orbits; Athena spent seconds computing them. The maneuver was a very difficult one, for though Jupiter V's own gravity was negligible, the satellite was trapped deep in Jupiter's enormous gravitational field. Discovery would have to make a speed change of over twenty thousand miles an hour to match orbits and achieve a rendezvous.
It could just be done-and, ironically, only the earlier disastcolored pencil seters made it possible. The ship was more than a ton lighter than expected at this stage of the mission, for it had lost two crew members, a spacepod, and the antenna complex. That was enough to make the difference between a maneuver that was barely feasible, and one which had a good safety margin.
Once Discovery had entered the parking orbit around Jupiter V, she could never leave it; her propellant reserves would be completely exhausted. And though the recovery ship would hardly expect to find her here, it would soon spot her radio beacon and her flashing strobe lights. Nuclear batteries would power them for twenty years; their detectable range was only about a million miles, but that was ample.
As soon as hcolored pencil sete was sure of the calculations, Bowman wasted no more time. The ten days were up: Jupiter V was still silent. The mission profile said: "Proceed with caution-in the event of hostility, withdraw."
That was excellent advice-except that retreat would be impossible. Once they had used their final reserves, they would be wholly committed.
After more than fifty orbits of Jupiter V, they had mapped and inspected its entire surface, most of which was covered with an icy rime of frozen ammonia. There was no sign of life, no hint of any activity. A search for radio emissions or electrical interference was fruitless; the little moon appeared to be completely dead. The theory that it was some kind of abandoned base, perhaps even a deserted city-world that ages ago had come here from some other solar system, slowly gained ground. Hunter was its chief advocate; when asked where he thought the hypothetical star- people had gone, he answered: "I think they were our ancestors." He was more than half serious about this, and refused to budge in the face of all the anthropological and geological evidence that could be thrown at him.
On the fourth day they dropped two of the ship's soft-landing probes-one on Kimball's Plain, the other at its antipodes. The radioed reports were inconclusive: the seismographs could detect no tremors-the sensitive geophones, not a whisper of internal sound. As far as the instruments could tell, Jupiter V was a dead lump of rock.
After two more days of waiting to see if anything had emerged to investigate the probes, Bowman made his decision. The others had been expecting it; from time to time, each had quietly hinted to Bowman that he should be the one to make the first reconnaissance.
In the carousel lounge, colored pencil setwhich had once seemed so small but was now, alas, larger than they required, he outlined the plan.
"We have only two pods," Bowman began, "and I'm going to commit them botcolored pencil seth: I think it will be safer that way. If one gets in trouble, the other will be there to help.
"Two pods will go down to the surface; one will stay on the brink of the chasm and the other will go in for a distance of not more than a thousand meters-less, if there's the slightest sign of danger. I'll take the forward one; Jack will be my Number Two."
At this, there were groans from Kaminski and Hunter; Bowman smiled and shook his head firmly.
"You have to stay behind and run the ship. If we don't come back, there's absolutely nothing you can do to help us. Your job is to watch, record what happens, and see that Earth gets the story-even if it's five years from now."
He listened patiently while Hunter and Kaminski pressed their superior claims, but he had already made up his mind. They were all equally qualified, but Kimball had discovered this place, and it now bore his name. It was only fair that he should be first to set foot on it.
Within an hour, the airlocks opened and the two little pods jetted themselves slowly out into space. After a few seconds of careful braking, they had checked their orbital speed, and Discovery was pulling away from them at her regular two hundred miles an hour. They were falling free, in the weak gravity field of Jupiter V. Their tenthousand-foot drop here was equivalent to a fall of less than a hundred feet on earth; they could wait until they were quite close to the surface before attempting to brake.
After a one-minute hover at a thousand feet, Bowman gave the signal for the final descent. There were no landing problems on this utterly flat plain, and he had decided to come down within a hundred yards of the pit. A last burst of power canceled the space pod's five or six pounds of weight, and he hovered for a second to give Kimball the privilege of landing first. Then he touched down on Jupiter V with scarcely a bump.
He glanced out of the port, saw that Kimball was O.K., and called the ship.
"Bowman to Discovery. Landed on Jupiter V. Can you read me?"
The answer, as he had expected, was already fading. In the few minutes of their descent, the ship's orbit had taken it down to the horizon, and was dropping below the edge of the satellite.
"Discovery to Bcolored pencil setowman. Message received but signal strength fading. Good luck. Will listen out and call you in ninety minutes."
"Roger."
Discovery was gone-not yet twenty miles away, but out of reach. It was true that she would be bacolored pencil setck again, by the inexorable laws of celestial mechanics, in just one and a half hours as she came up over the opposite horizon of this tiny world. That knowledge was some help, but not as much as they would have liked, to a pair of lonely men faced with a three-million-year-old enigma
Jetting the pod twenty feet off the surface, Bowman aimed toward the opening of the pit. As he approached that dark, gaping cavity, he suddenly remembered a childhood impression. When he was about ten years old, his father had taken him to the Grand Canyon, and the shock of first seeing that stupendous wound on the face of the earth had left a permanent imprint on his mind. The rectangular cleft toward which he was now drifting was tiny by comparison-but in this setting, on this desolate world, with the ominous half-moon of Jupiter hanging forever fixed in the inky sky-it seemed as awe-inspiring as the Grand Canyon. More so, indeed, for it was far deeper, and he could not guess what it concealed.
He brought the pod to rest a few feet from the brink, and surveyed the smooth, polished walls converging into the depth. The far walls were brilliant in the light of the sun, which ended abruptly in a slashing line of shadow about four hundred feet down. The feebler light of Jupiter, shining straight into the cleft, seemed to lose its power at a distance which Bowman could not even guess. Their was no sign of a bottom; the pit was like a classical exercise in perspective, all its parallel lines meeting at infinity. He tied the small, portable light which hooked onto the side of his space pod to his safety line, and let it fall the full length of the thousand meters. It took three minutes of uncannily slow-motion descent for the line to become taut; then the lamp was a bright star far down against the face of the shadowed wall. It had encountered no obstacles, provoked no reaction. Jupiter V had maintained its usual indifference.
Bowman suddenly decided that he had been cautious long enough. Not only were they running out of time, but there was only limited fuel for the pods. They had to make every minute count.
"I'm going in," he told Kimball. "I won't go further than the end of your safety line. Haul me out when I give the signal-or if I don't answer when you call me."
He could have made a free fall and come back on the jets, but there was no need to waste precious fuel. Kimball could reel him back without difficulty, for the safety line would have an apparent weight of only about five pounds at its end.
"Keep talking all the way, skipper," said Kimball. "It's kinda lonely up here."
Bowman was perfectly willing to comply. No matter how accustomed one became to low gravity, the ingrained responses of a million terrestrial ancestors died hard. He had to keep reminding himself that this pit in which he was dangling was not a miles-deep shaft on earth, down which he could go crashing to destruction if the slim thread of the safety line snapped. Though there might be danger here, it was not from gravity, and he must ignore the insistent warnings of his instincts.
"I must be two hundred feet down now," he said to Kimball. "Keep lowering me at the same rate-there's nothing to see yet, but I'll get a better view as soon as I'm out of the sunlight. Radiation count still negligible. There goes the sun-now I'm in the shadow, but there's still plenty of light from Jupiter. Still no sign of a bottom- this thing must be at least five miles deep-I feel like an ant crawling down a chimney-HELLO . . . !"
His voice trailed off incolored pencil set sudden excitement.
colored pencil set"What is it? Do you see something?" Kimball demanded.
"Yes-I think so. Now I'm out of the glare, my eyes are getting more sensitive. There's a light down there- a very dim one-a hell of a long way off. Just a minute while I unship the telescope."
There were sounds of heavy breathing and metallic clankings from Bowman's pod, now almost half a mile below the surface of Jupiter V. From the lip of the shaft where his own tiny private spacecraft was balanced as far over the brink as he dared risk it, Kimball could see the other pod only as a little group of red and white identification lights. He waited, with mounting excitement and impatience, as Bowman took his time with the telescope.
Then, coming from far below via the speaker of the radio link, came three simple words that chilled him to the bone.
"Oh my God . . ." said David Bowman, very quietly in a tone that conveyed no fear or alarm-only utter, incredulous, surprise.
"What is it?!"
He heard Bowman draw a deep breath, then answer in a voice that he would not have recognized, yet was completely under control.
"You won't believe this, Jack. That light down there-I wasn't mistaken. I've got the telescope on it-the image is perfectly dear. I can see the bottom end of the shaft. And it's full of stars."
THE IMPOSSIBLE STARS
"Say it again, Dave," said Kimball. "I didn't hear you clearly."
"I said it's full of stars."
colored pencil set"Do I read you correctly-stars?"
"Yes-thousands of them. It's like looking at the Milky Way."
"Listen, Dave-I'm going to haul you up and have a look myself-okay?"
To Kimball's surprise, Bowman agreed at once to this change of plan. Usually it was very difficult to divert the skipper from any procedure he had decided upon: he was fond of quoting Napoleon's "Order plus counterorder equals disorder." But now, he seemed not only willing but anxious to change places.
The line came up effortlessly; Bowman was obviously using the jets to help. When the pod floated up over the edge of the slot, Kimball peered into the bay-window, and was relieved to see his friend smile back, though in a slightly dazed manner.
"Sure you're okay?" he asked.
Bowman nodded.
"Sure," he colored pencil setsaid. "Go down and look yourself."
As the flawlessly smooth walls drifted by him, unbroken by any markings, unscarred by age, Kimball could not help recalling Alice's fall down the rabbit hole. It was an uncomfortable memory, for that strange descent had led to an underworld where magic reigned, and the normal laws of nature were overthrown. For the first time, he began to wonder if this might be happening here.
From the very beginning, they had known that they were dealing with a science greater than man's. But they had not doubted-they dared not doubt-that it was a science that they could ultimately understand. As the light below grew in size and brilliance, Kimball felt the first, appalling intimations that this might not be true.
It was a thought to hold at arm's length, especially in surroundings such as these. He was coming to the end of the line, and was already far below the last reflected rays of the sun. It required an act of physical courage to put the binoculars to his eyes, and to stare steadfastly at the tunnel's glowing end.
Bowman was ricolored pencil setght. He could have been looking at the Milky Way. The field ocolored pencil setf the instrument was full of stars- thousands of them, shining in the black core of this tiny, frozen world.
Some facts are so incredible that they are believed at once, for no one could possibly have imagined them. Kimball never doubted the message of his eyes, and did not try to understand it. For the moment, he would merely record what he saw.
Almost at once, he noticed that the stars were moving. They were drifting out of the field on the left, while new ones appeared from the right. It was as if he was looking down a shaft drilled clear through Jupiter V, and observing the effects of its rotation as it turned on its axis every ten hours.
But this, of course, was impossible. They had mapped and surveyed the entire area of the satellite, deliberately searching for any other entrance, and had found nothing but unbroken rock and ammonia ice. Kimball was quite certain that there was no window at the antipodes through which stars could shine.
And then, rather belatedly-he was, after all, a communications engineer and not an astronomer-he noticed something that totally demolished this theory. Those stars were drifting to his left; if the movement had been due to Jupiter V's spin, it should have been in a direction almost at right angles. So the rotation of the little moon had nothing whatsoever to do with it....
That was quite enough for one man, on one visit.
"I'm coming up," he called Bowman. "We'd better talk this over with Vic-maybe he has an explanation."
When he had rejoined Bowman on the surface of the satellite, it seemed to him that the once incredible sight of Jupiter spanning the sky was as familiar and reassuring as a quiet country landscape back on Earth. Jupiter they understood-or where it still held mysteries, they were not such that sapped the mind. But the thing beneath their feet defied all reason and all logic.
They waited, lost in their own thoughts and saying nothing, merely listening for the first sound of Discovery's beacon as she came up over the horizon. Luckily for their peace of mind, she was exactly on time; still without a word, they jetted themselves up toward her and, ten minutes later, were jockeying themselves through the airlock.
Astronauts are somewhat addicted to harmless practical jokes; it is one of their ways of asserting superiority over the Universe, which has no sense of humor. Kaminski and Hunter might, for a moment, have thought that the others were pulling their legs, but their doubts lasted no more than seconds.
Two orbits later, they went down themselves, taking cameras with long-focus lenses to record the star-patterns at the bottom of the shaft. Within minutes, Kaminski had an additional piece of information. He timed the movement of the stars across the opening, and calculated that it took fifteen hours for a complete revolution-as against Jupiter V's ten. It seemed that, by some magic of space or time, they were looking out into a strange universe through a window in the surface of a world that turned upon its axis once in every fifteen hours.
Kaminski was almost half a mile down the shaft when with shocking abruptness, the window looked upon a different scene.
SOMETHING IS SERIOUSLY WRONG WITH SPACE
Hunter, up on the surface, heard and recorded every word.
colored pencil set"I'll try a long exposure with the thousand-millimeter lens," Kaminski began. "I hate to confess it, but this is the first time I've ever done any astronomical photography. ... Hello!"
"What's happening?"
"The end of the slot's getting lighter. Yes, there's no doubt of it. There's a very faint glow along one side. You know, it looks like-my God-that's what it is!!"
"What, for heaven's sake?!"
"Sunrise! Sunrise! Leave mcolored pencil sete alone-I want to watch."
There were maddening minutes of silence, during which Hunter could hear only Kaminski's heavy breathing and, occasionally, the sound of instruments and controls being operated. Then, at long last, the astronomer spoke again, his voice full of wonder.
"It's a sun, all right. And it's enormous-it's completely filling the view. If I could see it all at once, it would look as big as Jupiter.
"And it's not a G-zero type like our sun. It's very dull and red-I don't even need dark filters on the telescope. Must be a red giant, like Antares. That's an idea-maybe it is Antares. Ah, here comes a sunspot-looks pretty small, but it could be as big as our whole sun...."
His voice trailed off into silence and again Hunter possessed himself in patience until at last Kaminski said: "Still no change-that sun's still blocking the view. It'll take hours to move out of the way. Let's get back to the ship-I want to study these photos. And I'd like to try an experiment, if I can talk Dave into it."
"What sort of experiment?"
"We still have most of our instrumented probes. This is the place to use them."
When they returned to the ship, Bowman was at first reluctant. If anything was dropped down the shaft, he pointed out, even this low gravity could give it a terminal speed of over a hundred miles an hour. There was no telling what damage it might do-or what reactions it might produce.
Kaminski finally settled the argument by pointing out that the designerscolored pencil set of this place would certainly have protected their handiwork against such trivial accidents. Every few centuries, a large meteor must plunge into the chasm at a far higher speed than any falling probe could attain.
Once the project had been agreed upon, Kimball acted as bombardier. Since the orbiting Discovery could track the probe only during the few seconds while it was passing directly over the slot, space capsule Alice was fitted with receiving gear. Kimball dropped the probe at the exact center of the chasm, then flew to the edge and waited on the brink, Alice's receiving antenna jutting out over the abyss.
At first the probe fell with the lecolored pencil setthargic slowness to be expected in Jupiter V's gravity field. Its instruments recorded a very slight temperature rise, but nothing else of importance. There was no radioactivity, no magnetic field.
And then, five miles down, it began to accelerate. Its signals started to drop rapidly in pitch, indicating a Doppler effect of astonishing magnitude. Kimball had to continually retune the receiver in order to keep track of the signals, and the radar started to indicate impossible ranges and velocities. In a few seconds, the probe was two hundred miles away-which, taken at face value, meant that it had gone right through Jupiter V and out the other side. Thereafter, it became more and more difficult to detect, and swiftly passed beyond the tuning range of the receiver. On the last contact, it had descended nine thousand and fifty miles down a hole which under no circumstances could be more than a hundred miles deep-the diameter of the tiny moon.
The radar was working perfectly; Kimball checked it with the utmost care as soon as he got back to the ship. The trouble must lie in Jupiter V-and Hunter neatly summed up what everybody was now beginning to suspect.
"I'm afraid," he said, "that there's something seriously wrong with space."
"A long time ago," said Kaminski, "I came across a remark that I've never forgotten-though I can't remember who made it. 'Any sufficiently advanced technology is indistinguishable from magic.' that's what we're up against here. Our lasers and mesotrons and nuclear reactors and neutrino telescopes would have seemed pure magic to the best scientists of the nineteenth century. But they could have understood how they worked-more or less- if we were around to explain the theory to them."
"I'd be glad to settle without the theory," remarked Kimball, "if I could even understand what this thing is-or what it's supposed to do."
"It seems to me," said Bowman, "that there are two possibilities-both just about equally impossible. The first is that Jupiter V is hollow-and there's some kind of micro-universe down there. A whole galaxy a hundred miles across."
"But the probes went thousands of miles, according to the radar readings."
"There could be some kind of distortion. Suppose the probes got smaller and smaller as they went in. Then they might seem to be thousands of miles away, when they were still really quite close."
"And that," said Kaminski, "reminds me of another quotation-one of Niels Bohr's. 'Your theory is crazy- but not crazy enough to be true.' "
"You have a crazier one?" asked Hunter.
"Yes, I do. I think the stars-and that sun down there- are part of our own universe, but we're seeing them through some new direction of space."
"I suppose you mean the fourth dimension."
"I doubt if it's anything as simple as that. But it probably does involve higher dimensions of some kind. Perhaps non-Euclidean ones."
"I get the idea. If you went down that hole, you'd come out hundreds or thousands of light- years away. But how long would the journey really be?"
"How long is the journey from New York to Washington? Two hundred miles if you fly south. But twenty-four thousand if you go in the other direction, over the North Pole. Both directions are equally real."
"I seem to remember," said Bowman, "that back on Earth you once told me that shortcuts through space-time were scientific nonsense-pure fantasy."
"Did I?" replied Kaminski, unabashed. "Well, I've changed my mind. Though I reserve the right to change it back again, if a better theory comes along."
"I'm a simpleminded engineer," said Hunter rather aggressively. "I see a hole going into Jupiter V, and not coming out anywhere. But you tell me that it does come out. How?'
Everyone waited hopefully for Kaminski to answer. For a moment he hemmed and hawed, then he suddenly brightened.
"I can only explain by means of analogy. Suppose you were a Flatlander, an inhabitant of a two- dimensional world like a sheet of paper-unable to move above or below it. If I drew a circle in your flat world, but left a small gap in it, you would say that the gap was the only way into the circle. Right?"
"Right."
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