Suddenly, like an automatic switch being thrown on an electronic relay, a memory shot into his thoughts. He was well-read in astronomy, particularly on the subject of the Moon, and the thought that struck him was this: _Astronomers did not see meteors crash into the Moon!_ They just didn't! And Moon observation under powerful telescopes was most exact; if even fair-sized meteors hit the Moon with the same explosive impact that they hit Earth, they would be seen beyond question. Further, since the Moon was a companion of the Earth, and our home planet was bombarded with countless meteors daily, the Moon must be a target of a like number. Of course, the meteors that hit Earth were almost entirely burned up by atmospheric friction long before reaching the surface. But the Moon apparently had no atmosphere ... there should have been nothing to prevent them from constantly battering the face of the Moon in a continuous, heavy rain of iron and rock. Lunar meteors should be visible all the time. But they were not! So ... what would really happen when his rocket hit the Moon? Robin was tingling with strange excitement. Facing death as he was, he knew that even at the moment of dying he would be rewarded with at least one secret of the universe now unknown to men. What was the secret? He wracked his brain trying to bring back to memory all that he had read on that problem. And he brought back the memory that during the past few years a growing number of astronomers had begun to believe that the Moon was not entirely without an atmosphere. It wasn't believed to have much of one, but it had been pointed out that most meteors to hit Earth burn up at least thirty miles high. And the atmosphere at that height on Earth was very, very thin. So thin indeed that if the Moon had a belt of air only that dense, it might not be particularly detectable from Earth, might not make much difference from the surface--it was almost a vacuum so far as living matter would be concerned--but it would suffice to burn up meteors! So it seemed likely that his rocket nose would be heated to incandescence by the tenuous Lunar atmosphere and burn to ash long before it touched the surface.... It wasn't a comforting thought--he rather preferred the original conception of crashing. Robin smiled grimly to himself. A dismal prospect, indeed. He had somehow cherished the hope that at least some wreckage of his rocket would be scattered about the surface, to be discovered some day by the explorers of the future, perhaps hundreds of years later. They would speculate upon it, perhaps trace it and in that way know that one Robin Carew had, in death, been the first to reach the Moon. But to burn up on high, even that faint honor would be denied him!