In view of its age, the body was in an excellent state of preservation. This was due to the environment in which it had been found—a germ-free hard vacuum and an abnormally low temperature sustained, even at Lunar noon, by the insulating mass of the surrounding rock. These conditions had prevented any onset of bacterial decay of the soft tissues. No rupture had been found in the space suit. So the currently favored theory regarding cause of death was that a failure in the life-support system had resulted in a sudden fall in temperature. The body had undergone deep freezing in a short space of time with a consequent abrupt cessation of metabolic processes; ice crystals, formed from body fluids, had caused widespread laceration of cell membranes. In the course of time most of the lighter substances had sublimed, mainly from the outer layers, to leave behind a blackened, shriveled, natural kind of mummy. The most seriously affected parts were the eyes, which, composed for the most part of fluids, had collapsed completely, leaving just a few flaky remnants in their sockets.

A major problem was the extreme fragility of the remains, which made any attempt at detailed examination next to impossible. Already the body had undergone some irreparable damage in the course of being transported to Earth, and in the removal of the space suit; only the body's being frozen solid during these operations had prevented the situation from being even worse. That was when somebody had thought of Felix Borden at IDCC and an instrument being developed in England that could display the insides of things. The result had been Caldwell's visit to Portland.

Inside the first laboratory it was dark. Researchers were using binocular microscopes to study sets of photographic transparencies arranged on several glass-topped tables, illuminated from below. Danchekker selected some plates from a pile and, motioning the others to follow, made his way over to the far wall. He positioned the first three of the plates on an eye-level viewing screen, snapped on the screen light, and stepped back to join the expectant semicircle. The plates were X-ray images showing the front and side views of a skull. Five faces, thrown into sharp relief against the darkness of the room behind, regarded the screen in solemn silence. At last Danchekker moved a pace forward, at the same time half turning toward them.