“The interstellar vidcasts do! No, Hedge developed a valid ftl drive. He managed to propel an object at fifty times the speed of light. But as the object gained speed, its length began to diminish and its mass increased. This was in line with familiar twentieth-century concepts of mass-energy transformation. We conjectured that as Hedge’s object gained velocity it would continue to lose length and gain mass until its length became nil and its mass infinite. Nobody can imagine such an object.”

“Goon.”

“But what actually occurred is this. Hedge’s object continued to lose length and gain mass until it reached the theoretical limit of velocity, the speed of light. At that point the object, still gaining speed, simply ceased to exist. Having no length, it ceased to occupy space. It disappeared. However, the object had not been destroyed. It continued on its way, gaining momentum each moment, moving in an arc across the galaxy, away from the Sol system. Hedge’s object entered some other realm of being, beyond our powers of conception. The next phase of Hedge’s experiment consisted in a search for some way to slow the ftl object down, back to a sub-ftl speed, hence back into our universe. This counterprinciple was eventually worked out.”

“With what result?”

“The death of Hedge and destruction of most of his equipment. His experimental object, in re-entering the space-time universe, came into being in space already occupied by matter. Possessing an incredible mass, just below infinity level, Hedge’s object exploded in a titanic cataclysm. It was obvious that no space travel was possible with such a drive. Virtually all space contains some matter. To re-enter space would bring automatic destruction. Hedge had found his ftl drive and his counterprinciple, but no one before this has been able to put them to any use.”

Reinhart walked over toward the great metal cylinder. Sherikov jumped down and followed him. “I don’t get it,” Reinhart said. “You said the principle is no good for space travel.”

“That’s right.”

“What’s this for, then? If the ship explodes as soon as it returns to our universe—”

“This is not a ship.” Sherikov grinned slyly. “Icarus is the first practical application of Hedge’s principles. Icarus is a bomb.”

“So this is our weapon,” Reinhart said. “A bomb. An immense bomb.”

“A bomb, moving at a velocity greater than light. A bomb which will not exist in our universe. The Centaurans won’t be able to detect or stop it. How could they? As soon as it passes the speed of light it will cease to exist—beyond all detection.”

“But—”

“Icarus will be launched outside the lab, on the surface. He will align himself with Proxima Centaurus, gaining speed rapidly. By the time he reaches his destination he will be traveling at ftl-100. Icarus will be brought back to this universe within Centaurus itself. The explosion should destroy the star and wash away most of its planets—including their central hub-planet, Armun. There is no way they can halt Icarus, once he has been launched. No defense is possible. Nothing can stop him. It is a real fact.”

“When will it be ready?”

Sherikov’s eyes flickered. “Soon.”

“Exactly how soon?”

The big Pole hesitated. “As a matter of fact, there’s only one thing holding us back.”

Sherikov led Reinhart around to the other side of the lab. He pushed a lab guard out of the way.

“See this?” He tapped a round globe, open at one end, the size of a grapefruit. “This is holding us up.”

“What is it?”

“The central control turret. This thing brings Icarus back to sub-ftl flight at the correct moment. It must be absolutely accurate. Icarus will be within the star only a matter of a microsecond. If the turret does not function exactly, Icarus will pass out the other side and shoot beyond the Centauran system.”

“How near completed is this turret?”

Sherikov hedged uncertainly, spreading out his big hands. “Who can say? It must be wired with infinitely minute equipment—microscope grapples and wires invisible to the naked eye.”

“Can you name any completion date?”

Sherikov reached into his coat and brought out a manila folder. “I’ve drawn up the data for the SRB machines, giving a date of completion. You can go ahead and feed it. I entered ten days as the maximum period. The machines can work from that.”

Reinhart accepted the folder cautiously. “You’re sure about the date? I’m not convinced I can trust you, Sherikov.”

Sherikov’s features darkened. “You’ll have to take a chance, Commissioner. I don’t trust you any more than you trust me. I know how much you’d like an excuse to get me out of here and one of your puppets in.”

Reinhart studied the huge scientist thoughtfully. Sherikov was going to be a hard nut to crack. Designs was responsible to Security, not the Council. Sherikov was losing ground—but he was still a potential danger. Stubborn, individualistic, refusing to subordinate his welfare to the general good.

“All right.” Reinhart put the folder slowly away in his coat. “I’ll feed it. But you better be able to come through. There can’t be any slip-ups. Too much hangs on the next few days.”

“If the odds change in our favor are you going to give the mobilization order?”

“Yes,” Reinhart stated. “I’ll give the order the moment I see the odds change.”

Standing in front of the machines, Reinhart waited nervously for the results. It was two o’clock in the afternoon. The day was warm, a pleasant May afternoon. Outside the building the daily life of the planet went on as usual.

As usual? Not exactly. The feeling was in the air, an expanding excitement growing every day. Terra had waited a long time. The attack on Proxima Centaurus had to come—and the sooner the better. The ancient Centauran Empire hemmed in Terra, bottled the human race up in its one system. Avast, suffocating net draped across the heavens, cutting Terra off from the bright diamonds beyond … And it had to end.

The SRB machines whirred, the visible combination disappearing. For a time no ratio showed. Reinhart tensed, his body rigid. He waited.

The new ratio appeared.

Reinhart gasped. 7-6. Toward Terra!

Within five minutes the emergency mobilization alert had been flashed to all Government departments. The Council and President Duffe had been called to immediate session. Everything was happening fast.

But there was no doubt. 7-6. In Terra’s favor. Reinhart hurried frantically to get his papers in order, in time for the Council session.

At histo-research the message plate was quickly pulled from the confidential slot and rushed across the central lab to the chief official.

“Look at this!” Fredman dropped the plate on his superior’s desk. “Look at it!”

Harper picked up the plate, scanning it rapidly. “Sounds like the real thing. I didn’t think we’d live to see it.”

Fredman left the room, hurrying down the hall. He entered the time bubble office. “Where’s the bubble?” he demanded, looking around.

One of the technicians looked slowly up. “Back about two hundred years. We’re coming up with interesting data on the War of 1914. According to material the bubble has already brought up—”

“Cut it. We’re through with routine work. Get the bubble back to the present. From now on all equipment has to be free for Military work.”

“But—the bubble is regulated automatically.”

“You can bring it back manually.”

“It’s risky.” The technician hedged. “If the emergency requires it, I suppose we could take a chance and cut the automatic.”

“The emergency requires everything.” Fredman said feelingly.

“But the odds might change back,” Margaret Duffe, President of the Council, said nervously. “Any minute they can revert.”