"It'll take as long to stop, of course, as it has taken to get out here, and if we ram them--GOOD NIGHT! Let's figure it out as nearly as we can." They calculated their own speed, and that of the other vessel, as shown by the various readings taken, and applied just enough negative acceleration to slow the Skylark down to the speed of the other space-car when they should come up with it. They smiled at each other in recognition of the perfect working of the mechanism when the huge vessel had spun, with a sickening lurch, through a complete half-circle, the instant the power was reversed. Each knew that they were actually traveling in a direction that to them seemed "down," but with a constantly diminishing velocity, even though they seemed to be still going "up" with an increasing speed. Until nearly the end of the calculated time the two took turns as before, but as the time of meeting drew near both men were on the alert, taking readings on the object-compass every few minutes. Finally Crane announced: "We are almost on them, Dick. They are so close that it is almost impossible to time the needle--less than ten thousand miles." Seaton gradually increased the retarding force until the needle showed that they were very close to the other vessel and maintaining a constant distance from it. He then shut off the power, and both men hurried to the bottom window to search for the fleeing ship with their powerful night-glasses. They looked at each other in amazement as they felt themselves falling almost directly downward, with an astounding acceleration. "What do you make of it, Dick?" asked Crane calmly, as he brought his glasses to his eyes and stared out into the black heavens, studded with multitudes of brilliant and unfamiliar stars. "I don't make it at all, Mart. By the feel, I should say we were falling toward something that would make our earth look like a pin-head. I remember now that I noticed that the bus was getting a little out of plumb with the bar all this last watch. I didn't pay much attention to it, as I couldn't see anything out of the way. Nothing but a sun could be big enough to raise all this disturbance, and I can't see any close enough to be afraid of, can you?" "No, and I cannot see the Steel space-car, either. Look sharp." "Of course," Seaton continued to argue as he peered out into the night, "it is theoretically possible that a heavenly body can exist large enough so that it could exert even this much force and still appear no larger than an ordinary star, but I don't believe it is probable. Give me three or four minutes of visual angle and I'll believe anything, but none of these stars are big enough to have any visual angle at all. Furthermore...." "There is at least half a degree of visual angle!" broke in his friend intensely. "Just to the left of that constellation that looks so much like a question mark. It is not bright, but dark, like a very dark moon--barely perceptible."