Naylo and Twill turned to Linus Brein.
"What do you think?" Twill asked.
Linus Brein shrugged. "He is undoubtedly right. Besides, we don't know all there is to know about the strange race out there yet."
"Oh, faugh! What else—"
Linus Brein smiled. He said slowly. "We don't even know whether or not they are oxygen-breathing."
"We can assume from the stellar type of their primaries that they are."
Linus nodded. "Probably, but not positively."
Regin Naylo said, "And what's second, Linus?"
"They may be contraterrene."