“Not this way.”
“Not what way?”
With an effort, Novee kept to his usual drawl. “No discussions except at official meetings. That was the decision.”
“I’ll have nothing to discuss,” said Cimon, gloomily. “They’re just two ordinary stars. Damned if I know why I volunteered. I suppose it was just the chance of seeing an abnormally large Trojan system from close up. It was the thought of looking at a habitable planet with a double sun. I don’t know why I should have thought there’d be anything amazing about it.”
“Because you thought of a thousand dead men and women,” said Xovee, then went on hastily. “Listen, tell me something, will you? What’s a Trojan planet, anyway?”
The physician bore the other’s look of contempt for a moment, then said, “All right. All right. So I don’t know. You don’t know everything either. What do you know about ultrasonic incisions?”
Cimon said, “Nothing, and I think I hat’s fine. It’s my opinion that information outside a professional man’s specialty is useless and a waste of psycho-potential. Sheffield’s point of view leaves me cold.”
“I still want to know. That is, if you can explain it.”
“I can explain it. As a matter of fact, it was mentioned in the original briefing, if you were listening. Most multiple stars, and that means one third of all stars, have planets of a sort. The trouble is that the planets are never habitable. If they’re far enough away from the center of gravity of the stellar system to have a fairly circular orbit, they’re cold enough to have helium oceans. If they’re close enough to get heat, their orbit is so erratic that at least once in each revolution, they get close enough to one or another of the stars to melt iron.
“Here in the Lagrange System, however, we have an unusual case. The two stars, Lagrange I and Lagrange II, and the planet, Troas—along with its satellite, Ilium—are at the corners of an imaginary equilateral triangle. Got that? Such an arrangement happens to be a stable one, and for the sake of anything you like, don’t ask me to tell you why. Just take it as my professional opinion.”