said Bliss, frowning. "We on Gaia know little astronomy compared to the traveling Isolates of the Galaxy, but I"m under the impression that binaries aren"t rare."
"They"re not," said Trevize. "There are substantially more binaries than there are single stars. However, the formation of two stars in close association upsets the ordinary processes of planetary formation. Binaries have less planetary material than single stars do. Such planets as do form about them often have relatively unstable orbits and are very rarely of a type that is reasonably habitable.
"Early explorers, I imagine, studied many binaries at close range but,after a while, for settlement purposes, they sought out only singles. And,of course, once you have a densely settled Galaxy, virtually all travel involves trade and communications and is carried on between inhabited worlds circling single stars. In periods of military activity, I suppose bases were sometimes set up on small, otherwise-uninhabited worlds circling one of the stars of a binary that happened to be strategically placed, but as hyperspatial travel came to be perfected, such bases were no longer necessary."
Pelorat said humbly, "It"s amazing how much I don"t know."
Trevize merely grinned. "Don"t let that impress you, Janov. When I was in the Navy, we listened to an incredible number of lectures on outmoded military tactics that no one ever planned, or intended to use,and were just talked about out of inertia. I was just rattling off a bit of one of them. Consider all you know about mythology, folklore,and archaic languages that I don"t know, and that only you and a very few others do know."
Bliss said, "Yes, but those two stars make up a binary system and one of them has an inhabited planet circling it."
"We hope it does, Bliss," said Trevize. "Everything has its exceptions. And with an official question mark in this case, which makes it more puzzling. No, Fallom, those knobs are not toys. Bliss,either keep her in handcuffs, or take her out."
"She won"t hurt anything," said Bliss defensively, but pulled the Solarian youngster to herself just the same. "If you"re so interested in that habitable planet, why aren"t we there already?"
"For one thing," said Trevize, "I"m just human enough to want to see this sight of a binary system at close quarters. Then, too, I"m just human enough to be cautious. As I"ve already explained, nothing has happened since we left Gaia that would encourage me to be anything but cautious."
Pelorat said, "Which one of those stars is Alpha, Golan?"
"We won"t get lost, Janov. The computer knows exactly which one is Alpha, and, for that matter, so do we. It"s the hotter and yellower of the two because it"s the larger. Now the one on the right has a distinct orange tinge to its light, rather like Aurora"s sun, if you recall. Do you notice?"
"Yes, now that you call it to my attention."
"Very well. That"s the smaller one. What"s the second letter of that ancient language you speak of?"
Pelorat thought a moment, and said, "Beta."
"Then let"s call the orange one Beta and the yellow-white one Alpha,and it"s Alpha we"re heading for right now."
Chapter 17: New Earth
74
"Four planets," muttered Trevize. "All are small,plus a trailing off of asteroids. No gas giants."
Pelorat said, "Do you find that disappointing?"
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