Then I began to make out additional markings, in the way that you do if you look through a telescope for long enough. There were faint crisscrossing lines on the surface of the satellite, and suddenly my eye grasped their full pattern. For it was a pattern: those lines covered Five with the same geometrical accuracy as the lines of latitude and longitude divide up a globe of the Earth. I suppose I gave my whistle of amazement, for then Bill pushed me out of the way and had his turn to look.
The next thing I remember is Professor Forster looking very smug while we bombarded him with questions.
"Of course," he explained, "this isn't as much a surprise to me as it is to you. Besides the evidence I'd found on Mercury, there were other clues. I've a friend at the Ganymede Observatory whom I've sworn to secrecy and who's been under quite a strain this last few weeks. It's rather surprising to anyone who's not an astronomer that the Observatory has never bothered much about the satellites. The big instruments are all used on extra-galactic nebulae, and the little ones spend all their time looking at Jupiter.
"The only thing the Observatory had ever done to Five was to measure its diameter and take a few photographs. They weren't quite good enough to show the markings we've just observed, otherwise there would have been an investigation before. But my friend Lawton detected them through the hundred-centimeter reflector when I asked him to look, and he also noticed something else that should have been spotted before. Five is only thirty kilometers in diameter, but it's much brighter than it should be for its size. When you compare its reflecting power—its aldeb—
"Its albedo."
"Thanks, Tony—its albedo with that of the other Moons, you find that it's a much better reflector than it should be. In fact, it behaves more like polished metal than rock."
"So that explains it!" I said. "The people of Culture X must have covered Five with an outer shell—like the domes they built on Mercury, but on a bigger scale."
The Professor looked at me rather pityingly.
"So you still haven't guessed!" he said.
I don't think this was quite fair. Frankly, would you have done any better in the same circumstances?
We landed three hours later on an enormous metal plain. As I looked through the portholes, I felt completely dwarfed by my surroundings. An ant crawling on the top of an oil-storage tank might have had much the same feelings—and the looming bulk of Jupiter up there in the sky didn't help. Even the Professor's usual cockiness now seemed to be overlaid by a kind of reverent awe.
The plain wasn't quite devoid of features. Running across it in various directions were broad bands where the stupendous metal plates had been joined together. These bands, or the crisscross pattern they formed, were what we had seen from space.
About a quarter of a kilometer away was a low hill— at least, what would have been a hill on a natural world. We had spotted it on our way in after making a careful survey of the little satellite from space. It was one of six such projections, four arranged equidistantly around the equator and the other two at the Poles. The assumption was pretty obvious that they would be entrances to the world below the metal shell.
I know that some people think it must be very entertaining to walk around on an airless, low-gravity planet in spacesuits. Well, it isn't. There are so many points to think about, so many checks to make and precautions to observe, that the mental strain outweighs the glamor—at least as far as I'm concerned. But I must admit that this time, as we climbed out of the airlock, I was so excited that for once these things didn't worry me.
The gravity of Five was so microscopic that walking was completely out of the question. We were all roped together like mountaineers and blew ourselves across the metal plain with gentle bursts from our recoil pistols. The experienced astronauts, Fulton and Groves, were at the two ends of the chain so that any unwise eagerness on the part of the people in the middle was restrained.
It took us only a few minutes to reach our objective, which we discovered to be a broad, low dome at least a kilometer in circumference. I wondered if it was a gigantic airlock, large enough to permit the entrance of whole spaceships. Unless we were very lucky, we might be unable to find a way in, since the controlling mechanisms would no longer be functioning, and even if they were, we would not know how to operate them. It would be difficult to imagine anything more tantalizing than being locked out, unable to get at the greatest archaeological find in all history.
We had made a quarter circuit of the dome when we found an opening in the metal shell. It was quite small— only about two meters across—and it was so nearly circular that for a moment we did not realize what it was. Then Tony's voice came over the radio:
"That's not artificial. We've got a meteor to thank for it."
"Impossible!" protested Professor Forster. "It's much too regular."
Tony was stubborn.
"Big meteors always produce circular holes, unless they strike very glancing blows. And look at the edges; you can see there's been an explosion of some kind. Probably the meteor and the shell were vaporized; we won't find any fragments."
"You'd expect this sort of thing to happen," put in Kingsley. "How long has this been here? Five million years? I'm surprised we haven't found any other craters."
"Maybe you're right," said the Professor, too pleased to argue. "Anyway, I'm going in first."
"Right," said Kingsley, who as captain has the last say in all such matters. "I'll give you twenty meters of rope and will sit in the hole so that we can keep radio contact. Otherwise this shell will blanket your signals."
So Professor Forster was the first man to enter Five, as he deserved to be. We crowded close to Kingsley so that he could relay news of the Professor's progress.
He didn't get very far. There was another shell just inside the outer one, as we might have expected. The Professor had room to stand upright between them, and as far as his torch could throw its beam he could see avenues of supporting struts and girders, but that was about all.
It took us about twenty-four exasperating hours before we got any further. Near the end of that time I remember asking the Professor why he hadn't thought of bringing any explosives. He gave me a very hurt look.
"There's enough aboard the ship to blow us all to glory," he said. "But I'm not going to risk doing any damage if I can find another way."
That's what I call patience, but I could see his point of view. After all, what was another few days in a search that had already taken him twenty years?
It was Bill Hawkins, of all people, who found the way in when we had abandoned our first line of approach. Near the North Pole of the little world he discovered a really giant meteor hole—about a hundred meters across and cutting through both the outer shells surrounding Five. It had revealed still another shell below those, and by one of those chances that must happen if one waits enough eons, a second, smaller, meteor had come down inside the crater and penetrated the innermost skin. The hole was just big enough to allow entrance for a man in a spacesuit. We went through head first, one at a time.
I don't suppose I'll ever have a weirder experience than hanging from that tremendous vault, like a spider suspended beneath the dome of St. Peter's. We only knew that the space in which we floated was vast. Just how big it was we could not tell, for our torches gave us no sense of distance. In this airless, dustless cavern the beams were, of course, totally invisible and when we shone them on the roof above, we could see the ovals of light dancing away into the distance until they were too diffuse to be visible. If we pointed them "downward" we could see a pale smudge of illumination so far below that it revealed nothing.
Very slowly, under the minute gravity of this tiny world, we fell downward until checked by our safety ropes. Overhead I could see the tiny glimmering patch through which we had entered; it was remote but reassuring.
And then, while I was swinging with an infinitely sluggish pendulum motion at the end of my cable, with the lights of my companions glimmering like fitful stars in t
he darkness around me, the truth suddenly crashed into my brain. Forgetting that we were all on open circuit, I cried out involuntarily:
"Professor—I don't believe this is a planet at all! It’s a spaceship!"
Then I stopped, feeling that I had made a fool of myself. There was a brief, tense silence, then a babble of noise as everyone else started arguing at once. Professor Forster's voice cut across the confusion and I could tell that he was both pleased and surprised.
"You're quite right, Jack. This is the ship that brought Culture X to the Solar System."
I heard someone—it sounded like Eric Fulton—give a gasp of incredulity.
"It's fantastic! A ship thirty kilometers across!"
"You ought to know better than that," replied the Professor with surprising mildness. "Suppose a civilization wanted to cross interstellar space—how else would it attack the problem? It would build a mobile planetoid out in space, taking perhaps centuries over the task. Since the ship would have to be a self-contained world, which could support its inhabitants for generations, it would need to be as large as this. I wonder how many suns they visited before they found ours and knew that their search was ended? They must have had smaller ships that could take them down to the planets, and of course they had to leave the parent vessel somewhere in space. So they parked it here, in a close orbit near the largest planet, where it would remain safely forever—or until they needed it again. It was the logical place: if they had set it circling the Sun, in time the pulls of the planets would have disturbed its orbit so much that it might have been lost. That could never happen to it here."
"Tell me, Professor," someone asked, "did you guess all this before we started?"
"I hoped it. All the evidence pointed to this answer. There's always been something anomalous about Satellite Five, though no one seems to have noticed it. Why this single tiny moon so close to Jupiter, when all the other small satellites are seventy times further away? Astronomically speaking, it didn't make sense. But enough of this chattering. We've got work to do."
That, I think, must count as the understatement of the century. There were seven of us faced with the greatest archaeological discovery of all time. Almost a whole world —a small world, an artificial one, but still a world—was waiting for us to explore. All we could perform was a swift and superficial reconnaissance: there might be material here for generations of research workers.
The first step was to lower a powerful floodlight on a power line running from the ship. This would act as a beacon and prevent us getting lost, as well as giving local illumination on the inner surface of the satellite. (Even now, I still find it hard to call Five a ship.) Then we dropped down the line to the surface below. It was a fall of about a kilometer, and in this low gravity it was quite safe to make the drop unretarded. The gentle shock of the impact could be absorbed easily enough by the spring-loaded staffs we carried for that purpose.
I don't want to take up any space here with yet another description of all the wonders of Satellite Five; there have already been enough pictures, maps and books on the subject. (My own, by the way is being published by Sidgwick and Jackson next Summer.) What I would like to give you instead is some impression of what it was actually like to be the first men ever to enter that strange metal world. Yet I'm sorry to say—I know this sounds hard to believe—I simply can't remember what I was feeling when we came across the first of the great mushroom-capped entrance shafts. I suppose I was so excited and so overwhelmed by the wonder of it all that I've forgotten everything else. But I can recall the impression of sheer size, something which mere photographs can never give. The builders of this world, coming as they did from a planet of low gravity, were giants—about four times as tall as men. We were pigmies crawling among their works.
We never got below the outer levels on our first visit, so we met few of the scientific marvels which later expeditions discovered. That was just as well; the residential areas provided enough to keep us busy for several lifetimes. The globe we were exploring must once have been lit by artificial sunlight pouring down from the triple shell that surrounded it and kept its atmosphere from leaking into space. Here on the surface the Jovians (I suppose I cannot avoid adopting the popular name for the people of Culture X) had reproduced, as accurately as they could, conditions on the world they had left unknown ages ago. Perhaps they still had day and night, changing seasons, rain and mist. They had even taken a tiny sea with them into exile. The water was still there, forming a frozen lake three kilometers across. I hear that there is a plan afoot to electrolize it and provide Five with a breathable atmosphere again, as soon as the meteor holes in the outer shell have been plugged.
The more we saw of their work, the more we grew to like the race whose possessions we were disturbing for the first time in five million years. Even if they were giants from another sun, they had much in common with man, and it is a great tragedy that our races missed each other by what is, on the cosmic scale, such a narrow margin.
We were, I suppose, more fortunate than any archaeologists in history. The vacuum of space had preserved everything from decay and—this was something which could not have been expected—the Jovians had not emptied their mighty ship of all its treasures when they had set out to colonize the Solar System. Here on the inner surface of Five everything still seemed intact, as it had been at the end of the ship's long journey. Perhaps the travelers had preserved it as a shrine in memory of their lost home, or perhaps they had thought that one day they might have to use these things again.
Whatever the reason, everything was here as its makers had left it. Sometimes it frightened me. I might be photographing, with Bill's help, some great wall carving when the sheer timelessness of the place would strike into my heart. I would look round nervously, half expecting to see giant shapes come stalking in through the pointed doorways, to continue the tasks that had been momentarily interrupted.
We discovered the art gallery on the fourth day. That was the only name for it; there was no mistaking its purpose. When Groves and Searle, who had been doing rapid sweeps over the southern hemisphere, reported the discovery we decided to concentrate all our forces there. For, as somebody or other has said, the art of a people reveals its soul, and here we might find the key to Culture X.
The building was huge, even by the standards of this giant race. Like all the other structures on Five, it was made of metal, yet there was nothing cold or mechanical about it. The topmost peak climbed half way to the remote roof of the world, and from a distance—before the details were visible—the building looked not unlike a Gothic cathedral. Misled by this chance resemblance, some later writers have called it a temple; but we have never found any trace of what might be called a religion among the Jovians. Yet there seems something appropriate about the name "The Temple of Art," and it's stuck so thoroughly that no one can change it now.
It has been estimated that there are between ten and twenty million individual exhibits in this single building— the harvest garnered during the whole history of a race that may have been much older than Man. And it was here that I found a small, circular room which at first sight seemed to be no more than the meeting place of six radiating corridors. I was by myself (and thus, I'm afraid, disobeying the Professor's orders) and taking what I thought would be a short-cut back to my companions. The dark walls were drifting silently past me as I glided along, the light of my torch dancing over the ceiling ahead. It was covered with deeply cut lettering, and I was so busy looking for familiar character groupings that for some time I paid no attention to the chamber's floor. Then I saw the statue and focused my beam upon it.
The moment when one first meets a great work of art has an impact that can never again be recaptured. In this case the subject matter made the effect all the more overwhelming. I was the first man ever to know what the Jovians had looked like, for here, carved with superb skill and authority, was one obviously modeled from life.
The slender, reptilian head was looking stra
ight toward me, the sightless eyes staring into mine. Two of the hands were clasped upon the breast as if in resignation; the other two were holding an instrument whose purpose is still unknown. The long, powerful tail—which, like a kangaroo's, probably balanced the rest of the body—was stretched out along the ground, adding to the impression of rest or repose.
There was nothing human about the face or the body. There were, for example, no nostrils—only gill-like openings in the neck. Yet the figure moved me profoundly; the artist had spanned the barriers of time and culture in a way I should never have believed possible. "Not human— but humane" was the verdict Professor Forster gave. There were many things we could not have shared with the builders of this world, but all that was really important we would have felt in common.
Just as one can read emotions in the alien but familiar face of a dog or a horse, so it seemed that I knew the feelings of the being confronting me. Here was wisdom and authority—the calm, confident power that is shown, for example, in Bellini's famous portrait of the Doge Loredano. Yet there was sadness also—the sadness of a race which had made some stupendous effort, and made it in vain.
We still do not know why this single statue is the only representation the Jovians have ever made of themselves in their art. One would hardly expect to find taboos of this nature among such an advanced race; perhaps we will know the answer when we have deciphered the writing carved on the chamber walls.
Yet I am already certain of the statue's purpose. It was set here to bridge time and to greet whatever beings might one day stand in the footsteps of its makers. That, perhaps, is why they shaped it so much smaller than life. Even then they must have guessed that the future belonged to Earth or Venus, and hence to beings whom they would have dwarfed. They knew that size could be a barrier as well as time.
A few minutes later I was on my way back to the ship with my companions, eager to tell the Professor about the discovery. He had been reluctantly snatching some rest, though I don't believe he averaged more than four hours sleep a day all the time we were on Five. The golden light of Jupiter was flooding the great metal plain as we emerged through the shell and stood beneath the stars once more.