"Yes. There is a super-dense class, still smaller, poorer in hydrogen, than the inner planets of the solar system. The ratio of occurrence of hydrogen-ammonia planets and these super-dense water-oxygen worlds of theirs over the entire Galaxy--and remember that they have actually conducted a survey of significant sample volumes of the Galaxy which we, without interstellar travel, cannot do--is about 3 to 1. This leaves them seven million super-dense worlds for exploration and colonization." The Industrialist looked at the blue sky and the green-covered trees among which they were making their way. He said, "And worlds like ours?" The Astronomer said, softly, "Ours is the first solar system they have found which contains them. Apparently the development of our solar system was unique and did not follow the ordinary rules." The Industrialist considered that. "What it amounts to is that these creatures from space are asteroid-dwellers." "No, no. The asteroids are something else again. They occur, I was told, in one out of eight stellar systems, but they're completely different from what we've been discussing." "And how does your being an astronomer change the fact that you are still only quoting their unsupported statements?" "But they did not restrict themselves to bald items of information. They presented me with a theory of stellar evolution which I had to accept and which is more nearly valid than anything our own astronomy has ever been able to devise, if we except possible lost theories dating from Beforethewars. Mind you, their theory had a rigidly mathematical development and it predicted just such a Galaxy as they describe. So you see, they have all the worlds they wish. They are not land-hungry. Certainly not for our land." "Reason would say so, if what you say is true. But creatures may be intelligent and not reasonable. Our forefathers were presumably intelligent, yet they were certainly not reasonable. Was it reasonable to destroy almost all their tremendous civilization in atomic warfare over causes our historians can no longer accurately determine?" The Industrialist brooded over it. "From the dropping of the first atom bomb over those islands--I forget the ancient name--there was only one end in sight, and in plain sight. Yet events were allowed to proceed to that end." He looked up, said briskly, "Well, where are we? I wonder if we are not on a fool's errand after all." But the Astronomer was a little in advance and his voice came thickly. "No fool's errand, sir. Look there." VI Red and Slim had trailed their elders with the experience of youth, aided by the absorption and anxiety of their fathers. Their view of the final object of the search was somewhat obscured by the underbrush behind which they remained. Red said, "Holy Smokes. Look at that. It's all shiny silver or something."