A voice called from below. Hunt rose to his feet, his movements slow and clumsy in his encumbering spacesuit, and clambered through the floor hatch and down a short ladder to the control cabin. The driver was stretching back in his seat, taking a long drink from a flask of hot coffee. Behind him, the sergeant in command of the vehicle was at a videoscreen, reporting back to base via comsat that they had reached their destination without mishap. The third crew member, a corporal who was to accompany Hunt and Alberts outside and who was already fitted out, was helping the professor secure his helmet. Hunt took his own helmet from the storage rack by the door and fixed it in place. When the three were ready, the sergeant supervised the final checkout of life-support and communications systems and cleared them to pass, one by one, through the airlock to the outside.
"Well, there you are, Vic. Really on the Moon now." Alberts’s voice came through the speaker inside Hunt’s helmet. Hunt felt the spongy dust yield beneath his boots and tried a few experimental steps up and down.
"It’s like Brighton Beach," he said.
"Okay, you guys?" asked the voice of the UNSA corporal.
"Okay."
"Sure."
"Let’s go, then."
The three brightly colored figures-one orange, one red, and one green-began moving slowly along the well-worn groove that ran up the center of the mound of rubble. At the top they stopped to gaze down at the survey vehicle, already looking toylike in the gorge below.
They moved into the cleft, climbing between vertical walls of rocks that closed in on both sides as they approached the bend. Above the bend the cleft straightened, and in the distance Hunt could see a huge wall of jagged buttresses towering over the foothills above them-evidently the ridge described in Charlie’s note. He could picture vividly the scene in this very place so long ago, when two other figures in spacesuits had toiled onward and upward, their eyes fixed on that same feature. Above it, the red and black portent of a tormented planet had glowered down on their final agony like…
Hunt stopped, puzzled. He looked up at the ridge again, then turned to stare at the bright disk of Earth, shining far behind his right shoulder. He turned to look one way, then back again the other.
"Anything wrong?" Alberts, who had continued on a few paces, had turned and was staring back at him.
"I’m not sure. Hang on there a second." Hunt moved up alongside the professor and pointed up and ahead toward the ridge. "You’re more familiar with this place than I am. See that ridge up ahead there-At any time in the year, could the Earth ever appear in a position over the top of it?"
Alberts followed Hunt’s pointing finger, glanced briefly back at the Earth, and shook his head decisively behind his facepiece.
"Never. From the Lunar surface, the position of Earth is almost constant. It does wobble about its mean position a bit as a result of libration, but not by anything near that much." He looked again. "Never anywhere near there. That’s an odd question. Why do you ask?"
"Just something that occurred to me. Doesn’t really matter for now."
Hunt lowered his eyes and saw an opening at the base of one of the walls ahead. "That must be it. Let’s carry on up to it."
The hole was exactly as he remembered from innumerable photographs. Despite its age, the shape betrayed its artificial origin. Hunt approached almost reverently and paused to finger the rock at one side of the opening with his gauntlet. The score marks had obviously been made by something like a drill.
"Well, that’s it," came the voice of Alberts, who was standing a few feet back. "Charlie’s Cave, we call it-more or less exactly as it must have been when he and his companion first saw it. Rather like treading in the sacred chambers of one of the pyramids, isn’t it?"
"That’s one way of putting it." Hunt ducked down to peer inside, pausing to fumble for the flashlight at his belt as the sudden darkness blinded him temporarily.
The rockfall that originally had covered the body had been cleared, and the interior was roomier than he expected. Strange emotions welled inside him as he stared at the spot where, millennia before the first page of history had been written, a huddled figure had painfully scrawled the last page of a story that Hunt had read so recently in an office in Houston, a quarter of a million miles away. He thought of the time that had passed since those events had taken place-of the empires that had grown and fallen, the cities that had crumbled to dust, and the lives that had sparkled briefly and been swallowed into the past-while all that time, unchanging, the secret of these rocks had lain undisturbed. Many minutes passed before Hunt reemerged and straightened up in the dazzling sunlight.
Again he frowned up toward the ridge. Something tantalizing was dancing elusively just beyond the fringes of the thinking portions of his mind, as if from the subconscious shadows that lay below, something insistent was shrieking to be recognized. And then it was gone.
He clipped the flashlight back into position on his belt and walked across to rejoin Alberts, who was studying some rock formations on the opposite wall.
Chapter Twenty
The giant ships that would fly on the fifth manned mission to Jupiter had been under construction in Lunar orbit for over a year. Besides the command ship, six freighters, each capable of carrying thirty thousand tons of supplies and equipment, gradually took shape high above the surface of the Moon. During the final two months before scheduled departure, the floating jumbles of machinery, materials, containers, vehicles, tanks, crates, drums, and a thousand other items of assorted engineering that hung around the ships like enormous Christmas-tree ornaments, were slowly absorbed inside. The Vega surface shuttles, deep-space cruisers, and other craft also destined for the mission began moving in over a period of several weeks to join their respective mother ships. At intervals throughout the last week, the freighters lifted out of Lunar orbit and set course for Jupiter. By the time its passengers and final complement of crew were being ferried up from the Lunar surface, only the command ship was left, hanging alone in the void. As H hour approached, the gaggle of service craft and attendant satellites withdrew and a flock of escorts converged to stand a few miles off, cameras transmitting live via Luna into the World News Grid.
As the final minutes ticked by, a million viewscreens showed the awesome mile-and-a-quarter-long shape drifting almost imperceptibly against the background of stars; the serenity of the spectacle seemed somehow to forewarn of the unimaginable power waiting to be unleashed. Exactly on schedule, the flight-control computers completed their final-countdown-phase checkout, obtained "Go" acknowledgment from the ground control master processor, and activated the main thermonuclear drives in a flash that was visible from Earth.
The Jupiter Five Mission was under way.
For the next fifteen minutes the ship gained speed and altitude through successively higher orbits. Then, shrugging off the restraining pull of Luna with effortless ease, Jupiter Five soared out and away to begin overtaking and marshaling together its flock of freighters, by this time already strung out across a million miles of space. After a while the escorts turned back toward Luna, while on Earth the news screens showed a steadily diminishing point of light, being tracked by the orbiting telescopes. Soon even that had vanished, and only the long-range radars and laser links were left to continue their electronic exchanges across the widening gulf.
Aboard the command ship, Hunt and the other UNSA scientists watched on the wall screen in mess twenty-four as the minutes passed by and Luna contracted into a full disk, partly eclipsing that of Earth beyond. In the days that followed, the two globes waned and fused into a single blob of brilliance, standing out in the heavens to signpost the way they had come. As days turned into weeks, even this shrank to become just another grain of dust among millions until, after about a month, they could pick it out only with difficulty.