National Geographic : 1964 Nov
peared to be about one-sixteenth the pri mary's size, with the others grading on down out of sight. In a given swarm the smaller secondaries, I reasoned, were far more numer ous than the large ones. Nuclear Blast Bears Out Theory By great good luck I found solid support for these ideas conveniently located on earth. At the Atomic Energy Commission's Nevada test site, there is a man-made nuclear crater which has the form if not the origin of a modest lunar primary. A swarm of more than 6,000 secondary craters was formed around that crater by the identical mechanics I had 704 postulated for the lunar secondaries. Like the latter, they were shallow, irregular, and generally rimless. The largest of them was one-sixteenth the primary's size. And as they grew smaller, their numbers increased. In the case of the moon's huge primaries which have rays extending outward from them, I observed that all the secondaries were clustered within the rays. The ray material was evidently debris tossed out by the sec ondaries. Such regions would be heavily pitted and poor places for an attempted land ing. As one of my colleagues said, "We wouldn't want a spacecraft to put down in all that secondary jazz."