Above, the brilliant signals of the traffic-boats flashed swiftly, clearing a wide lane for us, and then we had passed through the jam of traffic and were driving out past the incoming lines of interstellar ships at swiftly mounting speed, still holding the same formation with the massed cruisers behind us. Behind and around us, now, flamed the great panorama of the Galaxy's blazing stars, but before us lay only darkness--darkness inconceivable, into which our ships were flashing out at greater and greater speed. Neptune had vanished, and far behind lay the single yellow spark that was all visible of our solar system as we fled out from it. Out--out--out--rocketing, racing on, out past the boundaries of the great Galaxy itself into the lightless void, out into the unplumbed depths of infinite space to save our threatened sun. 2 Twenty-four hours after our start I stood again in the bridgeroom, alone except for the silent, imperturbable figure of my ever-watchful wheelman, Nal Jak, staring out with him into the black gulf that lay before us. Many an hour we had stood side by side thus, scanning the interstellar spaces from our cruiser's bridgeroom, but never yet had my eyes been confronted by such a lightless void as lay before me now. Our ship, indeed, seemed to be racing through a region where light was all but non-existent, a darkness inconceivable to anyone who had never experienced it. Behind lay the Galaxy we had left, a great swarm of shining points of light, contracting slowly as we sped away from it. Toward our right, too, several misty little patches of light glowed faintly in the darkness, hardly to be seen; though these, I knew, were other galaxies or star-clusters like our own--titanic conglomerations of thronging suns dimmed to those tiny flickers of light by the inconceivable depths of space which separated them from ourselves. Except for these, though, we fled on through a cosmic gloom that was soul-shaking in its deepness and extent, an infinite darkness and stillness in which our ship seemed the only moving thing. Behind us, I knew, the formation of our fifty ships was following close on our track, each ship separated from the next by a five hundred mile interval and each flashing on at exactly the same speed as ourselves. But though we knew they followed, our fifty cruisers were naturally quite invisible to us, and as I gazed now into the tenebrous void ahead the loneliness of our position was overpowering. Abruptly the door behind me snapped open, and I half turned toward it as Hurus Hol entered. He glanced at our speed-dials, and his brows arched in surprize. "Good enough," he commented. "If the rest of our ships can hold this pace it will bring us to the dark star in six days." I nodded, gazing thoughtfully ahead. "Perhaps sooner," I estimated. "The dark star is coming toward us at a tremendous velocity, remember. You will notice on the telechart----"