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  The Gentle Giants of Ganymede

  ( Giants - 2 )

  James P. Hogan

  Long before the world of the Ganymeans blew apart, millennia ago, the strange race of giants had vanished. All that remained of them was a wrecked ship, abandoned on a frozen moon of Jupiter. Now Earth's scientists were there, determined to ferret out the secret of the lost race. Then suddenly the Ganymeans returned, bringing with them answers that would alter all Mankind's knowledge of human origins . . .

  James P Hogan

  The Gentle Giants of Ganymede

  (Giants – 2)

  Prologue

  Leyel Torres, commander of the scientific observation base near the equator on Iscaris III, closed the final page of the report that he had been reading and stretched back in his chair with a grateful sigh. He sat for a while, enjoying the feeling of relaxation as the seat adjusted itself to accommodate his new posture, and then rose to pour himself a drink from one of the flasks on a tray on the small table behind his desk. The drink was cool and refreshing, and quickly dispelled the fatigue that had begun to build up inside him after more than two hours of unbroken concentration. Not much longer now, he thought. Two months more and they should be saying good-bye to this barren ball of parched rock forever and returning to the clean, fresh, infinite star-speckled blackness that lay between here and home.

  He cast his eye around the inside of the study of his private quarters in the conglomeration of domes, observatory buildings and communications antennas that had been home for the last two years. He was tired of the same, endless month-in, month-out routine. The project was exciting and stimulating it was true, but enough was enough; going home, as far as he was concerned, couldn't come a day too soon.

  He walked slowly over to the side of the room and stared for a second or two at the blank wall in front of him. Without turning his head he said aloud: "View panel. See-through mode."

  The wall immediately became one-way transparent, presenting him with a clear view out over the surface of Iscaris III. From the edge of the jumble of constructions and machinery that made up the base, the dry, uniform reddish-brown crags and boulders stretched all the way to the distinctly curved skyline where they abruptly came to an end beneath a curtain of black velvet embroidered with stars. High above, the fiery orb of Iscaris blazed mercilessly, its reflected rays filling the room with a warm glow of orange and red. As he looked out across the wilderness, a sudden longing welled up inside him for the simple pleasure of walking under a blue sky and breathing in the forgotten exhilaration of a wind blowing free. Yes, indeed--departure couldn't come a day too soon.

  A voice that seemed to issue from nowhere in particular in the room interrupted his musings.

  "Marvyl Chariso is requesting to be put through, Commander. He says it's extremely urgent."

  "Accept," Torres replied. He turned about to face the large view screen that occupied much of the opposite wall. The screen came alive at once to reveal the features of Chariso, a senior physicist, speaking from an instrumentation laboratory in the observatory. His face registered alarm.

  "Leyel," Chariso began without preamble. "Can you get down here right away. We've got trouble--real trouble." His tone of voice said the rest. Anything that could arouse Chariso to such a state had to be bad.

  "I'm on my way," he said, already moving toward the door.

  Five minutes later Torres arrived in the lab and was greeted by the physicist, who by this time was looking more worried than ever. Chariso led him to a monitor before a bank of electronic equipment where Galdern Brenzor, another of the scientists, was staring grim-faced at the curves and data analyses on the computer output screens. Brenzor looked up as they approached and nodded gravely.

  "Strong emission lines in the photosphere," he said. "Absorption lines are shifting rapidly toward the violet. There's no doubt about it; a major instability is breaking out in the core and it's running away."

  Torres looked over at Chariso.

  "Iscaris is going nova," Chariso explained. "Something's gone wrong with the project and the whole star's started to blow up. The photosphere is exploding out into space and preliminary calculations indicate we'll be engulfed here in less than twenty hours. We have to evacuate."

  Torres stared at him in stunned disbelief. "That's impossible."

  The scientist spread his arms wide. "Maybe so, but it's fact. Later we can take as long as you like to figure out where we went wrong, but right now we've got to get out of here. . . fast! "

  Torres stared at the two grim faces while his mind instinctively tried to reject what it was being told. He gazed past them at another large wall screen that was presenting a view being transmitted from ten million miles away in space. He was looking at one of the three enormous G-beam projectors, cylinders two miles long and a third of a mile across, that had been built in stellar orbit thirty million miles from Iscaris with their axes precisely aligned on the center of the star. Behind the silhouette of the projector Iscaris's blazing globe was still normal in appearance, but even as he looked he imagined that he could see its disk swelling almost imperceptibly but menacingly outward.

  For a moment his mind was swamped by emotions--the enormity of the task that suddenly confronted them, the hopelessness of having to think rationally under impossible time pressures, the futility of two years of wasted efforts. And then, as quickly as it had come, the feeling evaporated and the commander in him reasserted itself.

  "ZORAC," he called in a slightly raised voice.

  "Commander?" The same voice that had spoken in his study answered.

  "Contact Garuth on the Shapieron at once. Inform him that a matter of the gravest urgency has arisen and that it is imperative for all commanding officers of the expedition to confer immediately. I request that he put out an emergency call to summon them to link in fifteen minutes from now. Also, sound a general alert throughout the base and have all personnel stand by to await further instructions. I'll link in to the conference from the multiconsole in Room 14 of the Main Observatory Dome. That's all."

  Just over a quarter of an hour later Torres and the two scientists were facing an array of wall screens that showed the other participants in the conference. Garuth, commander-in-chief of the expedition, sat flanked by two aides in the heart of the mother-ship Shapieron two thousand miles above Iscaris III. He listened without interruption to the account of the situation. The chief scientist, speaking from elsewhere in the ship, confirmed that in the past few minutes sensors aboard the Shapieron had yielded data similar to that reported by instruments from the surface of Iscaris III, and that the computers had produced the same interpretation. The G-beam projectors had caused some unforeseen and catastrophic change in the internal equilibrium of Iscaris, and the star was in the process of turning into a nova. There was no time to think of anything but escape.

  "We have to get everybody off the surface," Garuth said. "Leyel, the first thing I need is a statement of what ships you've got down there at the moment, and how many personnel they can bring up. We'll send down extra shuttles to ferry out the rest as soon as we know what your shortage in carrying capacity is. Monchar . . ." He addressed his deputy on another of the screens. "Do we have any ships more than fifteen hours out from us at maximum speed?"

  "No, sir. The farthest away is out near Projector Two. It could make it back in just over ten."

  "Good. Recall them all immediately, emergency priority. If the figures we've just heard are right, the only way we'll stand a chance of getting clear is on the Shapieron's main drives. Prepare a schedule of expected arrival times and make sure that preparations for reception have been made."

  "Yes, sir."

  "Le
yel. . ." Garuth switched his gaze back to look straight out of the screen in Room 14 of the Observatory Dome. "Bring all your available ships up to flight-readiness and begin planning your evacuation at once. Report back on status one hour from now. One bag of personal belongings only per person."

  "May I remind you of a problem, sir." The chief engineer of the Shapieron , Rogdar Jassilane, added from the drive section of the ship.

  "What is it, Rog?" Garuth's face turned away to look at another screen.

  "We still have a fault on the primary retardation system for the main-drive toroids. If we start up those drives, the only way they'll ever slow down again is at their own natural rate. The whole braking system's been stripped down. We could never put it together again in under twenty hours, let alone trace the fault and fix it."

  Garuth thought for a moment. "But we can start them up okay?"

  "We can," Jassilane confirmed. "But once those black holes start whirling round inside the toroids, the angular momentum they'll build up will be phenomenal. Without the retardation system to slow them down, they'll take years to coast down to a speed at which the drives can be deactivated. We'd be under main drive all the time, with no way of shutting down." He made a helpless gesture. "We could end up anywhere."

  "But we've no choice," Garuth pointed out. "It's fly or fry. We'll have to set course for home and orbit the Solar System under drive until we've dropped to a low enough return velocity. What other way is there?"

  "I can see what Rog's getting at," the chief scientist interjected. "It's not quite as simple as that. You see, at the velocities that we would acquire under years of sustained main drive, we'd experience an enormous relativistic time-dilation compared to reference frames moving with the speed of Iscaris or Sol. Since the Shapieron would be an accelerated system, much more time would pass back home than would pass on board the ship; we know where we'd end up all right . . . but we won't be too sure of when. "

  "And, in fact, it would be worse than just that," Jassilane added. "The main drives work by generating a localized space-time distortion that the ship continuously'falls' into. This also produces its own time-dilation effect. Hence you'd have the compound effect of both dilations added together. What that would mean with an unretarded main drive running for years, I couldn't tell you--I don't think anything like it has ever happened."

  "I haven't done any precise calculations yet, naturally," the chief scientist said. "But if my mental estimates are anything to go by, we could be talking about a compound dilation of the order of millions."

  "Millions?" Garuth looked stunned.

  "Yes." The chief scientist looked out at them soberly. "For every year that we spend slowing down from the velocity that we'll need to escape the nova, we could find that a million years have passed by the time we get home."

  Silence persisted for a long time. At last Garuth spoke in a voice that was heavy and solemn. "Be that as it may, to survive we have no choice. My orders stand. Chief Engineer Jassilane, prepare for deep-space and bring the main drives up to standby readiness."

  Twenty hours later the Shapieron was under full power and hurtling toward interstellar space as the first outrushing front of the nova seared its hull and vaporized behind it the cinder that had once been Iscaris III.

  Chapter One

  In a space of time less than a single heartbeat in the life of the universe, the incredible animal called Man had fallen from the trees, discovered fire, invented the wheel, learned to fly and gone out to explore the planets.

  The history that followed Man's emergence was a turmoil of activity, adventure and ceaseless discovery. Nothing like it had been seen through eons of sedate evolution and slowly unfolding events that had gone before.

  Or so, for a long time, it had been thought.

  But when at last Man came to Ganymede, largest of the moons of Jupiter, he stumbled upon a discovery that totally demolished one of the few beliefs that had survived centuries of his insatiable inquisitiveness: He was not, after all, unique. Twenty-five million years before him, another race had surpassed all that he had thus far achieved.

  The fourth manned mission to Jupiter, early in the third decade of the twenty-first century, marked the beginning of intensive exploration of the outer planets and the establishment of the first permanent bases on the Jovian satellites. Instruments in orbit above Ganymede had detected a large concentration of metal some distance below the surface of the moon's ice crust. From a base specially sited for the purpose, shafts were sunk to investigate this anomaly.

  The spacecraft that they found there, frozen in its changeless tomb of ice, was huge. From skeletal remains found inside the ship, the scientists of Earth reconstructed a picture of the race of eight-foot-tall giants that had built it and whose level of technology was estimated as having been a century or more ahead of Earth's. They christened the giants the "Ganymeans," to commemorate the place of the discovery.

  The Ganymeans had originated on Minerva, a planet that once occupied the position between Mars and Jupiter but which had since been destroyed. The bulk of Minerva's mass had gone into a violently eccentric orbit at the edge of the Solar System to become Pluto, while the remainder of the debris was dispersed by Jupiter's tidal effects and formed the Asteroid Belt. Various scientific investigations, including cosmic-ray exposure-tests on material samples recovered from the Asteroid Belt, pinpointed the breakup of Minerva as having occurred some fifty thousand years in the past--long, long after the Ganymeans were known to have roamed the Solar System.

  The discovery of a race of technically advanced beings from twenty-five million years back was exciting enough. Even more exciting, but not really surprising, was the revelation that the Ganymeans had visited Earth. The cargo of the spacecraft found on Ganymede included a collection of plant and animal specimens the likes of which no human eye had ever beheld--a representative cross section of terrestrial life during the late Oligocene and early Miocene periods. Some of the samples were well preserved in canisters while others had evidently been alive in pens and cages at the time of the ship's mishap.

  The seven ships that were to make up the Jupiter Five Mission were being constructed in Lunar orbit at the time these discoveries were made. When the mission departed, a team of scientists traveled with it, eager to delve more deeply into the irresistibly challenging story of the Ganymeans.

  A data manipulation program running in the computer complex of the mile-and-a-quarter-long Jupiter Five Mission command ship, orbiting two thousand miles above Ganymede, routed its results to the message-scheduling processor. The information was beamed down by laser to a transceiver on the surface at Ganymede Main Base, and relayed northward via a chain of repeater stations. A few millionths of a second and seven hundred miles later, the computers at Pithead Base decoded the message destination and routed the signal to a display screen on the wall of a small conference room in the Biological Laboratories section. An elaborate pattern of the symbols used by geneticists to denote the internal structures of chromosomes appeared on the screen. The five people seated around the table in the narrow confines of the room studied the display intently.

  "There. If you want to go right down to it in detail, that's what it looks like." The speaker was a tall, lean, balding man clad in a white lab coat and wearing a pair of anachronistic gold-rimmed spectacles. He was standing in front and to one side of the screen, pointing toward it with one hand and clasping his lapel lightly with the other. Professor Christian Danchekker of the Westwood Biological Institute in Houston, part of the UN Space Arm's Life Sciences Division, headed the team of biologists who had come to Ganymede aboard Jupiter Five to study the early terrestrial aninials discovered in the Ganymean spacecraft. The scientists sitting before him contemplated the image on the screen. After a while Danchekker summarized once more the problem they had been debating for the past hour.

  "I hope it is obvious to most of you that the expression we are looking at represents a molecular arrangement characteristic of th
e structure of an enzyme. This same strain of enzyme has been identified in tissue samples taken from many of the species so far examined in the labs up in J4. I repeat--many of the species . . . many different species . . ." Danchekker clasped both hands to his lapels and gazed at his miniaudience expectantly. His voice fell almost to a whisper. "And yet nothing resembling it or suggestive of being in any way related to it has ever been identified in any of today's terrestrial animal species. The problem we are faced with, gentlemen, is simply to explain these curious facts."

  Paul Carpenter, fresh-faced, fair-haired and the youngest present, pushed himself back from the table and looked inquiringly from side to side, at the same time turning up his hands. "I guess I don't really see the problem," he confessed candidly. "This enzyme existed in animal species from twenty-five million years back--right?"

  "You've got it," Sandy Holmes confirmed from across the table with a slight nod of her head.

  "So in twenty-five million years they mutated out of all recognition. Everything changes over a period of time and it's no different with enzymes. Descendant strains from this one are probably still around but they don't look the same. . . ." He caught the expression on Danchekker's face. "No? . . . What's the problem?"

  The professor sighed a sigh of infinite patience. "We've been through all that, Paul," he said. "At least, I was under the impression that we had. Let me recapitulate: Enzymology has made tremendous advances over the last few decades. Just about every type has been classified and catalogued, but never anything like this one, which is completely different from anything we've ever seen."

  "I don't want to sound argumentative, but is that really true?" Carpenter protested. "I mean . . . we've seen new additions to the catalogues even in the last year or two, haven't we? There was Schnelder and Grossmann at Sгo Paulo with the P273B series and its derivatives. . . Braddock in England with--"