Lucky was at the mass detector, the delicate probe of which scoured space for any matter, fixing its position by measuring its response to the gravitational force of the ship, if it were small, or the effect of its gravitational force upon the ship, if it were large.
Wess had just awakened and entered the pilot room, and all was silence and tension as the ship sank toward Saturn. Bigman watched Lucky's face out of the corner of his eye. Lucky had grown more and more abstracted as Saturn came near, abstracted and uncommunicative. Bigman had witnessed this before. Lucky was uncertain; he was gambling on poor odds, and he would not talk of it.
Wess said, "I don't think you have to be sweating over the mass detector so, Lucky. There'll be no ships up here. It's when we get down to the rings that we'll find the ships. Plenty of them, probably. The Sirians will be looking for the capsule too."
"I agree with that," said Lucky, "as far as it goes."
"Maybe," said Bigman gloomily, "those cobbers have found the capsule already."
"Even that's possible," admitted Lucky.
They were turning now, beginning to edge along the circle of Saturn's globe, maintaining an eight-thousand-mile distance from its surface. The far half of the rings (or at least the portion that was in the sunlight) melted into Saturn as its inner edge was hidden by the giant planetary bulge.
In the case of the half rings on the near side of the planet, the inner "crepe ring" became more noticeable.
Bigman said, "You know, I don't make out any end to that inside ring."
Wess said, "There isn't any end, probably. The innermost part of the main rings is only six thousand miles above Saturn's apparent surface, and Saturn's atmosphere may stretch out that far."
"Six thousand miles!"
"Just in wisps, but enough to supply friction for the nearest bits of gravel and make them circle a bit closer to Saturn. Those that move in closer form the crepe ring. Only the closer they move, the more friction there is, so that they must move still closer. There are probably particles all the way down to Saturn, with some burning up as they hit the thicker layer of the atmosphere."
Bigman said, "Then the rings aren't going to last forever."
"Probably not. But they'll last millions of years. Long enough for us." He added somberly, "Too long."
Lucky interrupted, "I'm leaving the ship, gentlemen."
"Sands of Mars, Lucky. What for?" Bigman cried.
"I want an outside look," Lucky answered curtly. He was pulling on his space suit.
Bigman glanced quickly at the automatic record of the mass detector. No ships in space. There were occasional jogs, but nothing important. They were only the kind of drifting meteorites that were picked up anywhere in the Solar System.
Lucky said, "Take over at the mass detector, Wess. Let it take a round-the-clock sweep." Lucky put his helmet on and clicked it into place. He checked the gauges on his chest, the oxygen pressure, and moved toward the air lock. His voice now emerged from the small radio receiver on the control board. "I'll be using a magnetic cable, so make no sudden power thrusts."
"With you out there? Think I'm crazy?" said Bigman.
Lucky came into view at one of the ports, the magnetic cable snaking behind him in coils that, in the absence of gravity, did not form a smooth curve.
A small hand reactor in his gauntleted fist shot out its small jet stream, which became faintly visible in the weak sunlight as a cloud of tiny ice particles that dispersed and vanished. Lucky, by the law of action and reaction, moved in the opposite direction.
Bigman said, "Do you suppose something's wrong with the ship?"
"If there is," said Wess, "it doesn't show up anywhere on the control board."
"Then what's the big lug doing?"
"I don't know."
But Bigman shot a suspicious glare at the Council man, then turned again to watch Lucky. "If you think," he muttered, "because I'm not a Councilman… "
Wess said, "Maybe he just wanted to get outside range of your voice for a few minutes, Bigman."
The mass detector, on automatic sweep control, was moving methodically across the volume about them, square degree by square degree, the screen blanking out into pure white whenever it edged too far in the direction of Saturn itself.
Bigman scowled and lacked heart to respond to Wess's thrust. "I wish something would happen," he said.
And something did.
Wess, eyes returning to the mass detector, caught a suspicious pip on the recorder. He fixed the instrument on it hurriedly, brought up the auxiliary energy detectors, and followed it for two minutes.
Bigman said excitedly, "It's a ship, Wess."
"Looks like it," said Wess reluctantly. Mass alone might have meant a large meteorite, but there was a blast of energy being emitted from that direction that could come only from the micro-pile engines of a ship; the energy was of the right type and in the right quantities. It was as identifiable as a fingerprint. One could even detect the slight differences from the energy pattern produced by Terrestrial ships and identify this object unmistakably as a Sirian ship.
Bigman said, "It's heading for us."
"Not directly. Probably it doesn't dare take chances with Saturn's gravitational field. Still it's edging closer, and in about an hour it will be in position to lay down a barrage against us…What in space are you so pleased about, you Martian farm boy?"
"Isn't it obvious, you lump of fat? This explains why Lucky's out there. He knew the ship was coming and he's laying a trap for it."
"How in space could he tell a ship was coming?" demanded Wess in astonishment. "There was no indication on the mass detector till ten minutes ago. It wasn't even focused in the proper direction."
"Don't worry about Lucky. He has a way of knowing." Bigman was grinning.
Wess shrugged, moved to the control panel, and called into the transmitter, "Lucky! Do you hear me?"
"Sure I hear you, Wess. What's up?"
"There's a Sirian ship in mass-detection range."
"How close?"
"Under two hundred thousand and getting closer."
Bigman, watching out the port, noticed the flash of Lucky's hand reactor, and ice crystals swirled away from the ship. Lucky was returning.
"I'm coming in," he said.
Bigman spoke at once, as soon as the helmet was' lifted off Lucky's head to reveal his brown shock of hair and his clear brown eyes. Bigman said, "You knew that ship was coming, didn't you, Lucky?"
"No, Bigman. I had no idea. In fact, I don't understand how they discovered us so quickly. It's asking too much of coincidence to suppose they just happened to be looking in this direction."
Bigman tried to mask his chagrin. "Well, then, do we blast him out of space, Lucky?"
"Let's not go through the political dangers of attack again, Bigman. Besides, we have a mission here that's more important than playing shooting games with other ships."
"I know," said Bigman impatiently. "There's the capsule we've got to find, but… "
He shook his head. A capsule was a capsule and he understood its importance. But then, a good fight was a good fight, and Lucky's political reasoning about the dangers of aggression did not appeal to him if it meant ducking a fight. He muttered, "What do I do then? Stay on course?"
"And accelerate. Make for the rings."
"If we do," said Bigman, "they'll just take out after us."
"All right. We'll race."