"It blanketed," Chip told him, "every instrument on our ship. We tried to tune it out so we could see where we were going, but it was impossible. The result was we were easy prey for Jordan's gang. They clamped a tractor on us, crashed us on this asteroid. Only thing I don't understand," he frowned, "is how we managed to get within their range. I was blind-flying, true. But I forejetted the _Chickadee_ to avoid the possibility of ramming any asteroid--" Again Dr. Blaine shook his head. "You would have had a hard time avoiding this one, my boy. Because, you see, it was not sitting stationary. It was moving toward you." "Moving toward--Oh, no, Doctor! Impossible. The asteroids follow a clockwise course about the Sun!" "Not this one," denied the old man. "Because this is no ordinary asteroid, Warren. This whole rock, this mass of matter in space--is a navigable spaceship!" Salvation's jaw dropped open. He said in hallowed tones, "'Surely the Lord worketh in wondrous ways His marvels to unfold!' You said--a spaceship, Dr. Blaine?" Blaine's shoulders drooped dispiritedly. "Yes. This is the great invention on which I have labored in secret for years. The invention which I had hoped would prove a glorious boon to man. The construction of that one type of space-voyager which could be destroyed by only a most devastating catastrophe. "As you all know well, the major hazard of spaceflight is that the craft employed, however strongly constructed, is ever but a mote as compared with those hurtling celestial bodies it may chance to meet in space. Thus the efforts of science have ever been to cut down the collision risk. The Moran deflector ... the permalloy hood ... the automatic warp ... these are a few of the devices used. With some success, yes; but--there are failures, too. Each year more than a hundred ships crash headlong, or are crashed into by rogue asteroids, meteor swarms, bits of cosmic débris of mountainous size. "Patrol lightships have been placed in those locations recognized to be most dangerous to space travel. But you know that the toll taken by relentless Nature on these gallant ships is terrible. "I therefore dreamed that Man might build a gigantic lightship from a solid asteroid! A rock so large that no tiny meteor could damage it, one of sufficient mass to repel the advance of rogue asteroids. To the accomplishment of this I bent my efforts. You are within the result." "You mean," Chip demanded, "this entire planetoid is equipped with rockets? It can fly itself?" "Exactly. With an atomblast my laborers hollowed out living quarters, control chambers. At one-eighth mile intervals jets have been installed in the asteroid. These are fed from the central explosion chamber. In addition, gravity and atmosphere of Earth normal constant are maintained, when the planetoid is at rest, by means of energy-warp accumulators."