THE STAR RANGER sped through space toward its rendezvous point with the racing asteroid. Given the urgency of the situation, Zip had ordered the maximum acceleration that their bodies could tolerate. Mark had programmed their course to bring them as quickly as possible up to boarding speed with the asteroid. Having done that, he pored through the printed material he had taken from the asteroid’s power plant. He felt hopelessness creeping over him since he didn’t know what Zimbardo had done to burn it out. Zip came over and stood near where Mark was seated with a dim lamp illuminating the papers in front of him. The lamp was designed to burn with a soft light tinged with the faintest trace of light green, to be easiest on the eyes. It was devised for periods of long study. “Anything yet, Mark?” Zip asked, knowing that the question was pointless. If Mark had found even a tiny piece of information which could be remotely connected to the situation on the asteroid, he would have spoken up. “No, Zip,” replied Mark. “I can follow the diagrams pretty well now, and I think I understand how one part connects to another, but I can’t envision how any part of it could have burned out. I’ve tried to calculate how much power Zimbardo would have needed to generate the EMP of the size he did, but I can only guess at it. Even at my highest estimates, I can’t see how it would burn out the power supplies of a huge iron asteroid that can be used as a spacecraft. All I can imagine is that much of the power supply of the asteroid had been shut down before.” “You mean that its reserves were not in place?” “Something like that. We have guessed that the asteroid was a huge spacecraft. We also know that it had been stationary and abandoned--or at least unused--for eons. I suspect that the asteroid’s full power had never been accessible to Zimbardo. He was able to operate life-support systems, lights, airlocks, and so forth in his own section without drawing much power. When he tried to ‘power up’ the asteroid and move it out of orbit, he reached the limit of its available power. Then he suddenly initiated the electromagnetic pulse to fry the microwave probes, but he also fried his own system. But the asteroid _must_ have more power than that to be able to do what it must have done in the past. You saw the power plant as well as I did! Did it look to you as if Zimbardo could have burned that whole thing out with one EMP, no matter how intense?” “Makes sense, Mark. Where, then, is the rest of the power?” Mark looked up at Zip with a wan smile. “If you want to find it, you can help me look through these papers, if you want.” “All right, I will,” said Zip, and sat down. Mark handed him a stack of paper, showed Zip what to look for, and went back to his own study.