for ten years now and still the only thing they had was a combination of liquid oxygen and gasoline. They had tried liquid hydrogen but that had proved too cold, too difficult to confine, treacherous to handle, too bulky because of its low density. Liquid oxygen could be put under pressure, condensed into little space. It was safe to handle, safe until it combined with gasoline and then it was sheer death to anything that got within its reach.

Of course, there had been some improvements. Better handling of the fuel, for instance. Combustion chambers stood up better now because they were designed better. Feed lines didn't freeze so readily now as when the first coffins took to space. Rocket motors were more efficient, but still cranky.

But there were other things. Meteors, for one, and you couldn't do much about them. Not until someone designed a screen, and no one had. Radiations were another. Space was full of radiations and, despite the insulating jacket of ozone some of them seeped through.

Scott climbed through the rocket valve and turned to close it. He hesitated for a moment, drinking in the smell and sight of Earth. There wasn't much that one could see. The anxious face of Alexander, the huddled shadows that were watching men, the twinkling base camp lights.

With a curse at his own weakness, Scott slammed the valve lock, twirled it home.

Fitting himself into the shock absorbent chair, he fastened the straps that held him. His right foot reached out and found the trip that would fire the rockets. Then he lifted his wrist in front of his eyes and watched the second hand of the watch.

Ten seconds. Eight. Now five. The hand was creeping up, ticking off the time. It rested on the zero mark and he slammed down his foot. Cruel weight smashed down upon him, driving his body back into the padded chair. His lungs were flattened, the air driven from them. His heart thumped. Nausea seized him, and black mists swam before his eyes. He seemed to be slipping into a midnight chasm and he cried out weakly. His body went limp, sagging in the chair. Twin streams of blood trickled from his nose and down his lip.

He was far out in space when he struggled back to consciousness. For a time he did not stir. Lying in the chair, it took long minutes to realize where he was. Gradually his brain cleared and his eyes focused and made impressions on his senses. Slowly he became aware of the lighted instrument board, of the rectangle of quartz 

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