* * * * * Under full acceleration, the _Prometheus_ was soon nearing this destination. To allow for the Big Pill's forward motion, imparted to it by the ship's velocity even after release, he pressed the lever that opened the bomb-bay doors, and then jabbed the single button that controlled both release, and the firing of the gigantic missile's own propulsive jets. Without those jets, considering the centrifugal force of its vast velocity in a circular path around Titan, much overbalancing the feebler gravitational pull of the moon, it could not have started its fall at all. It needed jets to drive it down. Bert jabbed the button with his eyes closed since he had no precise target to hit. His teeth were gritted. With the sudden loss of mass, the ship lurched. Bert had to struggle for a moment to adjust the angle of its flaming stern-jets, and bring it back on course. In another few seconds he cut the stern-jets out entirely, and opened the fore-nozzles wide to check excess speed, and reestablish the _Prometheus_ in a stable orbit around Titan. One that could last forever without additional thrust. "Well, the Big Pill is on its way--for better or worse," Alice remarked. "Half of our job is done." But time had to pass before that metal colossus could drive itself and fall the thousand miles to the bleak, dried-out hills below. And the space ship hurtled on, to leave the point of coming impact far beyond the horizon. This, the Kraskows knew, was fortunate for them. The solid bulk of Titan would be the shield between them and holocaust. No human eyes could have looked directly on such a holocaust, at a range of a mere thousand miles, and not be burned from their sockets. Bert and Alice noticed that the Space Patrol craft were no longer pursuing them. Alice switched on the radio again but only jangled sounds came through. "Now for the last half of our job, Allie," Bert said. "First we attach shoulder-pack jets to our spacesuits." This was accomplished a few seconds before the stupendous flash of the Big Pill's explosion blazed beyond the horizon. The dark curve of Titan's bulk was limned against thin white fire that streamed outward toward the stars like comet's hair. The spectacle looked like a much-enlarged color-photo of a segment of a solar eclipse. The glare on the other side of Titan was so intense and far-reaching that the night-portions of huge Saturn and his other satellites, and the shadowed part of the fabulous, treasure-filled Rings, all hundreds of thousands of miles away, registered an easily perceptible flicker. But in airless space, of course, no sound was transmitted.