Coming up in a straight line, half the planet's disk was night. Half the day side was hidden by the planet's bulge. He actually saw no more than a quarter of the surface at this near approach, and that without magnification. Any large features would have been spotted from far away, but he had given up hope of any variation from monotony when—just as he was about to enter the atmosphere—one dark patch in the planet's uniformly dazzling white surface appeared at the very edge of day. It was at the very border of the dawn belt. He could be sure only of its existence, and that it had sharp, specifically straight edges. He saw rectangular extensions from the main mass of it. Then he hit atmosphere, and the thin stuff thrust at him violently because of his velocity, and he blinked and automatically turned his head aside, so that he did not see the dark patch again before his descent put it below the horizon. Even so near, no features, no natural formations appeared. There was only a vast brightness below him. He could make no guess as to his height nor—after he had slowed until the wind against his body was not detectable through the space suit—of his speed with relation to the ground. It was extraordinary. It occurred to him to drop something to get some idea, even if a vague one, of his altitude above the ground. He did—an oil-soaked rag from the tool kit. It went fluttering down and down, and abruptly vanished, relatively a short distance below him. It had not landed. It had been blotted out. Tired as he was, it took him minutes to think of turning on the suit-microphone which would enable him to hear sounds in this extraordinary world. But when he flicked the switch he heard a dull, droning, moaning noise which was unmistakable. Wind. Below him there was a sandstorm. He was riding just above its upper surface. He could not see the actual ground because there was an opaque wall of sand between. There might be five hundred feet between him and solidity, or five thousand, or there might be no actual solid, immovable ground at all. In any case, he could not possibly land. He rose again and headed for the dark area he had noted. But a space skid is not intended for use in atmosphere. Its power is great, to be sure, when its power unit is filled. But Stan had come a very long way indeed since his departure from the Stallifer. And his drive had blown a fuse, once, which cost him some power. Unquestionably, the blown fuse had been caused by the