"Here . . . here at Tycho was located their main power plant." He moved his fingers to a point near the equator and somewhat east of meridian—the point where three great dark areas merged, Mare Nubium, Mare Imbrium, Oceanus Procellarum —and picked out two bright splotches surrounded, also, by rays, but shorter, less distinct, and wavy. "And here at Copernicus and at Kepler, on islands at the middle of a great ocean, were secondary power stations."
He paused, and interpolated soberly: "Perhaps they knew the danger they ran, but wanted power so badly that they were willing to gamble the life of their race. Perhaps they were ignorant of the ruinous possibilities of their little machines, or perhaps their mathematicians assured them that it could not happen.
"But we will never know—no one can ever know. For it blew up and killed them—and it killed their planet.
"It whisked off the gassy envelope and blew it into outer space. It blasted great chunks off the planet's crust. Perhaps some of that escaped completely, too, but all that did not reach the speed of escape fell back down in time and splashed great ring-shaped craters in the land.
"The oceans cushioned the shock; only the more massive fragments formed craters through the water. Perhaps some life still remained in those ocean depths. If so, it was doomed to die—for the water, unprotected by atmospheric pressure, could not remain liquid and must inevitably escape in time to outer space. Its life-blood drained away. The planet was dead—dead by suicide!"
He met the grave eyes of his two silent listeners with an expression almost of appeal. "Gentlemen . . . this is only a theory, I realize . . . only a theory, a dream, a nightmare . . . but it has kept me awake so many nights that I had to come tell you about it, and see if you saw it the same way I do. As for the mechanics of it, it's all in there in my notes. You can check it—and I pray that you find some error! But it is the only lunar theory I have examined which included all of the known data and accounted for all of them."
He appeared to have finished. Lentz spoke up. "Suppose, Captain, suppose we check your mathematics and find no flaw—what then?"
Harrington flung out his hands. "That's what I came here to find out!"
Although Lentz had asked the question, Harrington directed the appeal to King. The Superintendent looked up; his eyes met the astronomer's, wavered and dropped again. "There's nothing to be done," he said dully, "nothing at all."
Harrington stared at him in open amazement. "But good God, man!" he burst out. "Don't you see it? That bomb has got to be disassembled—at once!"
"Take it easy, Captain." Lentz's calm voice was a spray of cold water. "And don't be too harsh on poor King—this worries him even more than it does you. What he means is this: We're not faced with a problem in physics, but with a political and economic situation. Let's put it this way: King can no more dump the bomb than a peasant with a vineyard on the slopes of Mount Vesuvius can abandon his holdings and pauperize his family simply because there will be an eruption some day.
"King doesn't own that bomb out there; he's only the custodian. If he dumps it against the wishes of the legal owners, they'll simply oust him and put in someone more amenable. No, we have to convince the owners."
"The President could do it," suggested Harrington. "I could get to the President—"
"No doubt you could, through the Navy Department. And you might even convince him. But could he help much?"
"Why, of course he could. He's the President !"
"Wait a minute. You're Director of the Naval Observatory; suppose you took a sledge hammer and tried to smash the big telescope—how far would you get?"
"Not very far," Harrington conceded. "We guard the big fellow pretty closely."
"Nor can the President act in an arbitrary manner," Lentz persisted. "He's not an unlimited monarch. If he shuts down this plant without due