Nal Jak?'
The eyes of my two friends met and glanced away, while I looked anxiously toward them. Then Hurus Hol spoke slowly.
'We are imprisoned in this little room in one of the great pyramids of the glowing city,' he said. 'And in this room you have lain for weeks, Ran Rarak.'
'Weeks?' I gasped, and he nodded. 'It's been almost ten weeks since we were captured there in the city outside,' he said, 'and for all that time you've lain here out of your head from that blow you received, sometimes delirious and raving, sometimes completely unconscious. And in all that time this dark star, this world, has been plunging on through space toward our Galaxy, and our sun, and the theft and doom of that sun. Ten more days and it passes our sun, stealing it from the Galaxy. And I, who have learned at last what forces are behind it all, lie prisoned here.
'It was after we four were brought to this cell, after our capture, that I was summoned before our captors, before a council of those strange tentacle-creatures which was made up, I think, of their own scientists. They examined me, my clothing, all about me, then sought to communicate with me. They did not speak-communicating with each other by telepathy-but they strove to enter into communication with me by a projection of pictures on a smooth wall, pictures of their dark star world, pictures of our own Galaxy, our own sun-picture after picture, until at last I began to understand the drift of them, the history and the purpose of these strange beings and their stranger world.
'For ages, I learned, for countless eons, their mighty sun had flashed through the infinities of space, alone except for its numerous planets upon which had risen these races of tentacle-creatures. Their sun was flaming with life, then, and on their circling planets they had attained to immense science, immense power, as their system rolled on, a single wandering star, through the depths of uncharted space. But as the slow eons passed, the mighty sun began to cool, and their planets to grow colder and colder. At last it had cooled so far that to revive its dying fires they dislodged one of their own planets from its orbit and sent it crashing into their sun, feeding its waning flames. And when more centuries had passed and it was again cooling they followed the same course, sending another planet into it, and so on through the ages, staving off the death of their sun by sacrificing their worlds, until at last but one planet was left to them. And still their sun was cooling, darkening, dying. 'For further ages, though, they managed to preserve a precarious existence on their single planet by means of artificial heat-production, until at last their great sun had cooled and solidified to such a point that life was possible upon its dark, dead surface. That surface, because of the solidified radio-active elements in it, shone always with pale light, and to it the races of the tentacle-creatures now moved. By means of great air-current projectors they transferred the atmosphere of their planet to the dark star itself and then cast loose their planet to wander off into space by itself, for its orbit had become erratic and they feared that it would crash into their own great dark star world, about which it had revolved. But on the warm, shining surface of the great dark star they now spread out and multiplied, raising their cities from its glowing rock and clinging to its surface as it hurtled on and on and on through the dark infinities of trackless space.
'But at last, after further ages of such existence, the tentacle-races saw that again they were menaced with extinction, since in obedience to the inexorable laws of nature their dark star was cooling still further, the molten fires at its center which warmed its surface gradually dying down, while that surface became colder and colder. In a little while, they knew, the fires at its center would be completely dead, and their great world would be a bitter, frozen waste, unless they devised some plan by which to keep warm its surface.
'At this moment their astronomers came forward with the announcement that their dark-star world, plunging on through empty space, would soon pass a great star-cluster or Galaxy of suns at a distance of some fifteen billion miles. They could not invade the worlds of this Galaxy, they knew, for they had discovered that upon those worlds lived countless trillions of intelligent inhabitants who would be able to repel their own invasion, if they attempted it. There was but one expedient left, therefore, and that was to attempt to jerk a sun out of this Galaxy as they passed by it, to steal a star from it to take out with them into space, which would revolve around their own mighty dark world and supply it with the heat they needed.
'The sun which they fixed on to steal was one at the Galaxy's very edge, our own sun. If they passed this at fifteen billion miles, as their course then would cause them to do, they could do nothing. But if they could change their dark star's course, could curve inward to pass this sun at some three billion miles instead of fifteen, then the powerful gravitational grip of their own gigantic world would grasp this sun and carry it out with it into space. The sun's planets, too, would be carried out, but these they planned to crash into the fires of the sun itself, to increase its size and splendor. All that was needed, therefore, was some method of curving their world's course inward, and for this they had recourse to the great gravity-condensers which they had already used to shift their own planets.
'You know that it is gravitational force alone which keeps the suns and planets to their courses, and you know that the gravitational force of any body, sun or planet, is radiated out from it in all directions, tending to pull all things toward that body. In the same way there is radiated outward perpetually from the Galaxy that combined attractive gravitational force of all its swarming suns, and a tiny fraction of this outward-radiating force, of course, struck the dark star, pulling it weakly toward the Galaxy. If more of that outward-radiating force could strike the dark star, it would be pulled toward the Galaxy with more power, would be pulled nearer toward the Galaxy's edge, as it passed.
'It was just that which their gravity-condenser accomplished. In a low pit at the heart of one of their cities this city, in fact-they placed the condenser, a mass of brilliant hemispherical ray-attracters which caused more of the Galaxy's outward-shooting attractive force to fall upon the dark star, thereby pulling the dark star inward toward the Galaxy's edge in a great curve. When they reached a distance of three billion miles from the Galaxy's edge they planned to turn off the great condenser, and their dark star would then shoot past the Galaxy's edge, jerking out our sun with it, from that edge, by its own terrific gravitational grip. If the condenser were turned off before they came that close, however, they would pass the sun at a distance too far to pull it out with them, and would then speed on out into space alone, toward the freezing of their world and their own extinction. For that reason the condenser, and the great cage-switch of the condenser, were guarded always by hovering cones, to prevent its being turned off before the right moment.
'Since then they have kept the great gravity-condenser in unceasing operation, and their dark star has swept in toward the Galaxy's edge in a great curve. Back in our own solar system I saw and understood what would be the result of that inward curve, and so we came here-and were captured. And in those weeks since we were captured, while you have lain here unconscious and raving, this dark star has been plunging nearer and nearer toward our Galaxy and toward our sun. Ten more days and it passes that sun, carrying it out with it into the darkness of boundless space, unless the great condenser is turned off before then. Ten more days, and we lie here, powerless to warn any of what forces work toward the doom of our sun!'
There was a long silence when Hurus Hol's voice had ceased-a whispering, brain-crushing silence which I broke at last with a single question.
'But Nal Jak-?' I asked, and the faces of my two companions became suddenly strange, while Dal Nara turned away. At last Hurus Hol spoke.
'It was after the tentacle-scientists had examined me.' he said gently, 'that they brought Nal Jak down to examine. I think that they spared me for the time being because of my apparently greater knowledge, but Nal Jak they-vivisected.'
There was a longer hush than before, one in which the brave, quiet figure of the wheelman, a companion in all my service with the fleet, seemed to rise before my suddenly blurring eyes. Then abruptly I swung down from the narrow bunk on which I lay, clutched dizzily at my companions for support, and walked unsteadily to the square, barred little window. Outside and beneath me lay the city of the dark-star people, a mighty mass of pyramidal, glowing buildings, streets thronged with their dark, gliding figures, above them the swarms of the racing cones. From our little window the glowing wall of the great pyramid which held us slanted steeply down for fully five hundred feet, and upward above us for twice that distance. And as I raised my eyes upward I saw, clear and bright above, a great, far-flung field of stars-the stars of our own Galaxy toward which this world was plunging. And burning out clearest among these the star that was nearest of all, the shining yellow star that was our own sun.
I think now that it was the sight of that yellow star, largening steadily as our dark star swept on toward it,
