Trevize owlishly, while one hand gripped Bliss's hand tightly.
Trevize had looked up from the computer and had said, rather churlishly, "Quite the family group!" but that was only his own discomfort speaking.
He instructed the computer to Jump in such a way as to reenter space at a further distance from the star in question than was absolutely necessary. He told himself that that was because he was learning caution as a result of events on the first two Spacer worlds, but he didn't believe that. Well underneath, he knew, he was hoping that he would arrive in space at a great enough distance from the star to be uncertain as to whether it did or did not have a habitable planet. That would give him a few more days of in-space travel before he could find out, and (perhaps) have to stare bitter defeat in the face.
So now, with the "family group" watching, he drew a deep breath, held it, then expelled it in a between-the-lips whistle as he gave the computer its final instruction.
The star-pattern shifted in a silent discontinuity and the viewscreen became barer, for he had been taken into a region in which the stars were somewhat sparser. And there, nearly in the center, was a brightly gleaming star.
Trevize grinned broadly, for this was a victory of sorts. After all, the third set of co-ordinates might have been wrong and there might have been no appropriate G-type star in sight. He glanced toward the other three, and said, "That's it. Star number three."
"Are you sure?" asked Bliss softly.
"Watch!" said Trevize. "I will switch to the equi-centered view in the computer's Galactic map, and if that bright star disappears, it's not recorded on the map, and it's the one we want."
The computer responded to his command, and the star blinked out without any prior dimming. It was as though it had never been, but the rest of the starfield remained as it was, in sublime indifference.
"We've got it," said Trevize.
And yet he sent the Far Star forward at little more than half the speed he might easily have maintained. There was still the question of the presence or absence of a habitable planet, and he was in no hurry to find out. Even after three days of approach, there was still nothing to be said about that, either way.
Or, perhaps, not quite nothing. Circling the star was a large gas giant. It was very far from its star and it gleamed a very pale yellow on its daylight side, which they could see, from their position, as a thick crescent.
Trevize did not like its looks, but he tried not to show it and spoke as matter-of-factly as a guidebook. "There's a big gas giant out there," he said. "It's rather spectacular. It has a thin pair of rings and two sizable satellites that can be made out at the moment."
Bliss said, "Most systems include gas giants, don't they?"
"Yes, but this is a rather large one. Judging from the distance of its satellites, and their periods of revolution, that gas giant is almost two thousand times as massive as a habitable planet would be."
"What's the difference?" said Bliss. "Gas giants are gas giants and it doesn't matter what size they are, does it? They're always present at great distances from the star they circle, and none of them are habitable, thanks to their size and distance. We just have to look closer to the star for a habitable planet."
Trevize hesitated, then decided to place the facts on the table. "The thing is," he said, "that gas giants tend to sweep a volume of planetary space clean. What material they don't absorb into their own structures will coalesce into fairly large bodies that come to make up their satellite system. They prevent other coalescences at even a considerable distance from themselves, so that the larger the gas giant, the more likely it is to be the only sizable planet of a particular star. There'll just be the gas giant and asteroids."
"You mean there is no habitable planet here?"
"The larger the gas giant, the smaller the chance of a habitable planet and that gas giant is so massive it is virtually a dwarf star."
Pelorat said, "May we see it?"
All three now stared at the screen (Fallom was in Bliss's room with the j books).
The view was magnified till the crescent filled the screen. Crossing that crescent a distance above center was a thin dark line, the shadow of the ring system