I nodded. "Yes, but it ought to reach us within a few more hours. We'll halt our ships here until it reaches us, and as it passes we can ascertain its extent and report to General Patrol Headquarters at Canopus. They can send out meteor-sweeps then to destroy the swarm before it can enter the galaxy and menace interstellar navigation." Even while I spoke Korus Kan had swiftly shifted the levers in his grasp, quickly reducing our craft's great speed, while the half-score of ships behind us slowed their own flight at the same moment in answer to his signal. The humming drone of our great propulsion-vibration generators waned to a thin whine and then died altogether as our ships came to a halt, while at the same moment the dozen ship-dots on the space-chart ceased to move also, hanging motionless on that chart as we were hanging motionless in space. Inches to the right of them, though, the close-massed dots of the mighty swarm were still creeping steadily across the chart, though now their unheard-of speed was fast slackening. In silent awe we regarded them. Out there in the awful void beside us, we knew, the great swarm was rushing ever closer toward us even as those thousands of close-massed dots crept toward our own ship-dots, and a strange tension held us as we watched them moving nearer. To any of our comrades in the Interstellar Patrol it would have seemed strange enough, no doubt, the tense silence in which we watched the approach of the swarm, for surely a meteor-swarm more or less was nothing new to us. We had met with many a one in our patrols inside the galaxy, and many a time had aided in the work of the great star-cruising meteor-sweeps which keep free of them the space-lanes between the galaxy's suns. But this swarm, rushing toward us out of the mighty depths of outer space, was different. Never in all our history had any such mighty swarm of matter as this come toward our galaxy from the unplumbed outer void, and at such a speed as this one. For though it was moving slower and slower there on the space-chart, the great swarm was still flashing through space toward the galaxy at more than a thousand light-speeds, a velocity greater than that of any of our ships. Silently we watched, there in the pilot room, while the swarm of close-massed dots crept across the big space-chart, toward the galaxy and toward the dozen dots that were our ships. Slower and slower still it was moving, its speed smoothly and steadily decreasing as it swept in toward the galaxy from outer space. Such a decrease in speed was strange enough, we knew, but knew too that if the swarm was being borne on toward us by a terrific ether-current its speed would slacken as the speed of the current slackened.