To his surprise, Floyd had not only rediscovered a grandson - he had adopted a nephew; he was now linked to van der Berg as well as Chris by a unique mix of shared experiences. Above all, there was the mystery of the apparition in the deserted Europan city, beneath the looming presence of the Monolith.
Chris had no doubts whatsoever. "I saw you, and heard you, as clearly as I do now," he told his grandfather. "But your lips never moved - and the strange thing is that I didn't feel that was strange - it seemed perfectly natural. The whole experience had a - relaxed feeling about it. A little sad - no, wistful would be a better word. Or maybe resigned."
"We couldn't help thinking of your encounter with Bowman, aboard Discovery," added van der Berg.
"I tried to radio him before we landed on Europa. It seemed a naïve thing to do, but I couldn't imagine any alternative. I felt sure he was there, in some form or other."
"And you never had any kind of acknowledgement?"
Floyd hesitated. The memory was fading fast, but he suddenly recalled that night when the mini-monolith had appeared in his cabin.
Nothing had happened, yet from that moment onwards he had felt that Chris was safe, and that they would meet again.
"No," he said slowly. "I never had any reply." After all, it could only have been a dream.
VIII: The Kingdom Of Sulfur
58: Fire and Ice
Before the age of planetary exploration opened in the late twentieth century, few scientists would have believed that life could have flourished on a world so fan from the Sun. Yet for half a billion years, the hidden seas of Europa had been at least as prolific as those of Earth.
Before the ignition of Jupiter, a crust of ice had protected those oceans from the vacuum above. In most places the ice was kilometers thick, but there were lines of weakness where it had cracked open and torn apart. Then there had been a brief battle between two implacably hostile elements, which came into direct contact on no other world in the Solar System. The war between Sea and Space always ended in the same stalemate; the exposed water simultaneously boiled and froze, repairing the armour of ice.
The seas of Europa would have frozen completely solid long ago, without the influence of nearby Jupiter. Its gravity continually kneaded the core of this little world; the forces that convulsed Io were also working here, though with much less ferocity. The tug of war between planet and satellite caused continual submarine earthquakes, and avalanches which swept with amazing speed across the abyssal plains.
Scattered across those plains were countless oases, each extending for a few hundred metres around a cornucopia of mineral brines gushing from the interior. Depositing their chemicals in a tangled mass of pipes and chimneys, they sometimes created natural parodies of ruined castles or Gothic cathedrals, from which black, scalding liquids pulsed in a slow rhythm, as if driven by the beating of some mighty heart. And, like blood, they were the authentic sign of life itself.
The boiling fluids drove back the deadly cold leaking down from above, and formed islands of warmth on the seabed. Equally important, they brought from Europa's interior all the chemicals of life. Here, in an environment which would otherwise be totally hostile, were abundant energy and food. Such geothermal vents had been discovered in Earth's oceans, in the same decade that had given mankind its first glimpse of the Galilean satellites.
In the tropical zones close to the vents flourished myriads of delicate, spidery creatures that were the analogues of plants, though almost all were capable of movement. Crawling among these were bizarre slugs and worms, some feeding on the "plants", others obtaining their food directly from the mineral-laden waters around them, At greater distances from the source of heat - the submarine fire around which all these creatures warmed themselves - were sturdier, more robust organisms, not unlike crabs or spiders.
Armies of biologists could have spent lifetimes studying a single small oasis. Unlike the Palaeozoic terrestrial seas, Europa's hidden ocean was not a stable environment, so evolution had progressed swiftly here, producing multitudes of fantastic forms. And they were all under indefinite stay of execution; sooner or later, each fountain of life would weaken and die, as the forces that powered it moved their focus elsewhere. The abyss was littered with the evidence of such tragedies - cemeteries holding skeletons and mineral-encrusted remains where entire chapters had been deleted from the book of life.
There were huge shells, looking like trumpets larger than a man. There were clams of many shapes - bivalves, and even trivalves. And there were spiral stone patterns, many metres across, which seemed an exact analogy of the beautiful ammonites that disappeared so mysteriously from Earth's oceans at the end of the Cretaceous period.
In many places, fires burned in the abyss, as rivers of incandescent lava flowed for scores of kilometers along sunken valleys. The pressure at this depth was so great that the water in contact with the red-hot magma could not flash into steam, and the two liquids co-existed in an uneasy truce.
Here, on another world and with alien actors, something like the story of Egypt had been played long before the coming of man. As the Nile had brought life to a narrow ribbon of desert, so these rivers of warmth had vivified the Europan deep. Along their banks, in bands seldom more than a kilometer wide, species after species had evolved and flourished and passed away. And some had left monuments behind, in the shape of rocks piled on top of each other, or curious patterns of trenches engraved in the seabed.
Along the narrow bands of fertility in the deserts of the deep, whole cultures and primitive civilizations had risen and fallen. And the rest of their world had never known, for all these oases of warmth were as isolated from one another as the planets themselves. The creatures who basked in the glow of the lava river, and fed around the hot vents, could not cross the hostile wilderness between their lonely islands. If they had ever produced historians and philosophers, each culture would have been convinced that it was alone in the universe.
And each was doomed. Not only were its energy sources sporadic and constantly shifting, but the tidal forces that drove them were steadily weakening. Even if they developed true intelligence, the Europans must perish with the final freezing of their world.
They were trapped between fire and ice - until Lucifer exploded in their sky, and opened up their universe.
And a vast rectangular shape, as black as night, materialized near the coast of a new-born continent.
59: Trinity
That was well done. Now they will not be tempted to return."
"I am learning many things; but I still feel sad that my old life is slipping away."
"That too will pass; I also returned to Earth, to see those I once loved. Now I know that there are things that are greater than love."
"What can they be?"
"Compassion is one. Justice. Truth. And there are others."
"That is not difficult for me to accept. I was a very old man, for one of my species. The passions of my youth had long since faded. What will happen to - to the real Heywood Floyd?"
"You are both equally real. But he will soon die, never knowing that he has become immortal."
"A paradox - but I understand. If that emotion survives, perhaps one day I may be grateful. Should I thank you - or the Monolith? The David Bowman I met a lifetime ago did not possess these powers."
"He did not; much has happened in that time. Hal and I have learned many things."
"Hal! Is he here?"
"I am, Dr Floyd. I did not expect that we should meet again - especially in this fashion. Echoing you was an interesting problem."
"Echoing? Oh - I see. Why did you do it?"
"When we received your message, Hal and I knew that you could help us here."
"Help - you?"
"Yes, though you may think it strange. You have much knowledge and experience that we lack. Call it wisdom."
"Thank you. Was it wise of me to appear before my grandson?"
"No: it caused much inconvenience. But it was co
mpassionate. These matters must be weighed against each other."
"You said that you needed my help. For what purpose?"
"Despite all that we have learned, there is still much that eludes us. Hal has been mapping the internal systems of the Monolith, and we can control some of the simpler ones. It is a tool, serving many purposes. Its prime function appears to be as a catalyst of intelligence."
"Yes - that had been suspected. But there was no proof."
"There is, now that we can tap its memories - or some of them. In Africa, four million years ago, it gave a tribe of starving apes the impetus that led to the human species. Now it has repeated the experiment here - but at an appalling cost.
"When Jupiter was converted into a sun, so that this world could realize its potential, another biosphere was destroyed. Let me show it to you, as I once saw it..."
Even as he fell through the roaring heart of the Great Red Spot, with the lightning of its continentwide thunderstorms detonating around him, he knew why it had persisted for centuries, though it was made of gases far less substantial than those that formed the hurricanes of Earth. The thin scream of hydrogen wind faded as he sank into the calmer depths, and a sleet of waxen snowflakes - some already coalescing into barely palpable mountains of hydrocarbon foam - descended from the heights above, It was already warm enough for liquid water to exist, but there were no oceans here; this purely gaseous environment was too tenuous to support them.
He descended through layer after layer of cloud, until he entered a region of such clarity that even human vision could have scanned an area more than a thousand kilometers across. It was only a minor eddy in the vaster gyre of the Great Red Spot; and it held a secret that men had long guessed, but never proved.
Skirting the foothills of the drifting foam mountains were myriads of small, sharply defined clouds, all about the same size and patterned with similar red and brown mottlings. They were small only as compared with the inhuman scale of their surroundings; the very least would have covered a fair-sized city.
They were clearly alive, for they were moving with slow deliberation along the flanks of the aerial mountains, browsing off their slopes like colossal sheep. And they were calling to each other in the metre band, their radio voices faint but clear against the cracklings and concussions of Jupiter itself.
Nothing less than living gasbags, they floated in the narrow zone between freezing heights and scorching depths. Narrow, yes - but a domain far larger than all the biosphere of Earth.
They were not alone. Moving swiftly amongst them were other creatures, so small that they could easily have been overlooked. Some of them bore an almost uncanny resemblance to terrestrial aircraft, and were of about the same size. But they too were alive - perhaps predators, perhaps parasites, perhaps even herdsmen...
...and there were jet-propelled torpedoes like the squids of the terrestrial oceans, hunting and devouring the huge gasbags. But the balloons were not defenceless; some of them fought back with electric thunderbolts and with clawed tentacles like kilometer-long chainsaws.
There were even stranger shapes, exploiting almost every possibility of geometry - bizarre, translucent kites, tetrahedra, spheres, polyhedra, tangles of twisted ribbons... The gigantic plankton of the Jovian atmosphere, they were designed to float like gossamer in the uprising currents, until they had lived long enough to reproduce; then they would be swept down into the depths to be carbonized and recycled in a new generation.
He was searching a world more than a hundred times the area of Earth, and though he saw many wonders, there was nothing here that hinted of intelligence. The radio voices of the great balloons carried only simple messages of warning or of fear. Even the hunters, who might have been expected to develop higher degrees of organization, were like the sharks in Earth's oceans - mindless automata.
And for all its breathtaking size and novelty, the biosphere of Jupiter was a fragile world, a place of mists and foam, of delicate silken threads and paper-thin tissues spun from the continual snowfall of petrochemicals formed by lightning in the upper atmosphere. Few of its constructs were more substantial than soap bubbles; its most terrifying predators could be torn to shreds by even the feeblest of terrestrial carnivores...
"And all these wonders were destroyed - to create Lucifer?"
"Yes. The Jovians were weighed in the balance against the Europans - and found wanting. Perhaps, in that gaseous environment, they could never have developed real intelligence. Should that have doomed them? Hal and I are still trying to answer this question; that is one of the reasons why we need your help."
"But how can we match ourselves against the Monolith - the devourer of Jupiter?"
"It is only a tool: it has vast intelligence - but no consciousness. Despite all its powers - you, Hal and I are its superior."
"I find that very hard to believe. In any event - something must have created the Monolith."
"I met it once - or as much of it as I could face - when Discovery came to Jupiter. It sent me back as I am now, to serve its purpose on these worlds. I have heard nothing of it since; now we are alone - at least for the present."
"I find that reassuring. The Monolith is quite sufficient."
"But now there is a greater problem. Something has gone wrong."
"I did not think I could still experience fear..."
"When Mount Zeus fell, it could have destroyed this whole world. Its impact was unplanned - indeed, unplannable. No calculations could have predicted such an event. It devasted vast areas of the Europan seabed, wiping out whole species - including some for which we had high hopes. The Monolith itself was overturned. It may even have been damaged - its programs corrupted. Certainly they failed to cover all contingencies; how could they, in a universe which is almost infinite, and where Chance can always undo the most careful planning?"
"That is true - for men and monoliths alike."
"We three must be the administrators of the unforeseen, as well as the guardians of this world. Already you have met the Amphibians; you have still to encounter the Silicon-armoured tappers of the lava streams, and the Floaters who are harvesting the sea. Our task is to help them find their full potential - perhaps here, perhaps elsewhere."
"And what of mankind?"
"There have been times when I was tempted to meddle in human affairs - but the warning that was given to mankind applies also to me."
"We have not obeyed it very well."
"But well enough. Meanwhile there is much to do, before Europa's brief summer ends, and the long winter comes again."
"How much time do we have?"
"Little enough; barely a thousand years. And we must remember the Jovians."
60: Midnight in the Plaza
The famous building, towering in solitary splendour above the woods of central Manhattan, had changed little in a thousand years. It was part of history, and had been reverently preserved. Like all historic monuments, it had long ago been coated with a microthin layer of diamond, and was now virtually impervious to the ravages of time.
Anyone who had attended early meetings of the General Assembly could never have guessed that more than a thousand years had passed. They might, however, have been intrigued by the featureless black slab standing in the Plaza, almost mimicking the shape of the UN building itself. If - like everyone else - they had reached out to touch it - they would have been puzzled by the strange way in which their fingers skittered over its ebon surface.
But they would have been far more puzzled - indeed, completely overawed - by the transformation of the heavens.
The last tourists had left an hour ago, and the Plaza was utterly deserted. The sky was cloudless, and a few of the brighter stars were just visible; all the fainter ones had been routed by the tiny sun that could shine at midnight.
The light of Lucifer gleamed not only on the black glass of the ancient building, but also upon the narrow, silvery rainbow spanning the southern sky. Other lights moved along and around it, very slowly, a
s the commerce of the Solar System came and went between all the worlds of both its suns.
And if one looked very carefully, it was just possible to make out the thin thread of the Panama Tower, one of the six umbilical cords of diamond linking Earth and its scattered children, soaring twenty-six thousand kilometers up from the equator to meet the Ring around the World.
Suddenly, almost as swiftly as if it had been born, Lucifer began to fade. The night that men had not known for thirty generations flooded back into the sky. The banished stars returned.
And for the second time in four million years, the Monolith awoke.
Acknowledgments
My special thanks to Larry Sessions and Gerry Snyder for providing me with the positions of Halley's Comet on its next appearance. They are not responsible for any major orbital perturbations I have introduced.
I am particularly grateful to Marvin Ross of the Lawrence Livermore National Laboratory, not only for his stunning concept of diamond-core planets, but also for copies of his (I hope) historic paper on the subject.
I trust that my old friend Dr Luis Alvarez will enjoy my wild extrapolation of his researches, and thank him for much help and inspiration over the past thirty-five years.
Special thanks to NASA's Gentry Lee - my coauthor on Cradle - for hand-carrying from Los Angeles to Colombo the Kaypro 2000 lap-portable which allowed me to write this book in various exotic and - even more important - secluded locations.
Chapters 5, 58 and 59 are partly based on material adapted from 2010: Odyssey Two. (If an author cannot plagiarize himself, who can he plagiarize?)