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would live for a while yet. He knew that Sally had been scared on his account, and that her matter-of-fact manner was partly assumed. She was at least as much wrought up as he was.

And this was the first time he was going into what would be the first space ship ever to leave the Earth on a non-return journey.

7

Nobody could have gone through the changes of emotion Joe had experienced that morning and remained quite matter-of-fact. Seeing a dead man who had more or less deliberately killed himself so that he wouldn’t have to kill Joe—for one—had its effect. Knowing that it was certainly possible the man hadn’t killed himself in time had another. Being checked over for radiation burns which would mean that he’d die quite comfortably within three or four days, and then learning that no burns existed, was something of an ordeal. And Sally—of course her feelings shouldn’t have been as vivid as his own, but the fact that she’d been scared for him held some significance. When, on top of all the rest, he went into the Space Platform for the first time, Joe was definitely keyed up.

But he talked technology. He examined the inner skin and its lining before going beyond the temporary entrance. The plating of the Platform was actually double. The outer layer was a meteor-bumper against which particles of cosmic dust would strike and explode without damage to the inner skin. They could even penetrate it without causing a leak of air. Inside the inner skin there was a layer of glass wool for heat insulation. Inside the glass wool was a layer of material serving exactly the function of the coating of a bulletproof gasoline tank. No meteor under a quarter-inch size could hope to make a puncture, even at the forty-five-mile-per-second speed that is the theoretical maximum for meteors. And if one did, the selfsealing stuff would stop the leak immediately. Joe could explain the protection of the metal skins. He did.

“When a missile travels fast enough,” he said absorbedly, “it stops acquiring extra puncturing ability. Over a mile a second, impact can’t be transmitted from front to rear. The back end of the thing that hits has arrived at the hit place before the shock of arrival can travel back to it. It’s like a train in a collision which doesn’t stop all at once. A meteor hitting the Platform will telescope on itself like the cars of a railroad train that hits another at full speed.”

Sally listened enigmatically.

“So,” said Joe, “the punching effect isn’t there. A meteor hitting the Platform won’t punch. It’ll explode. Part of it will turn to vapor—metallic vapor if it’s metal, and rocky vapor if it’s stone. It’ll blow a crater in the metal plate. It’ll blow away as much weight of the skin as it weighs itself. Mass for mass. So that weight for weight, pea soup would be just as effective armor against meteors as hardened steel.”

Sally said: “Dear me! You must read the newspapers!”

“The odds figure out, the odds are even that the Platform won’t get an actual meteor puncture in the first twenty thousand years it’s floating round the Earth.”

“Twenty thousand two seventy, Joe,” said Sally. She was trying to tease him, but her face showed a little of the strain. “I read the magazine articles too. In fact I sometimes show the tame article writers around, when they’re cleared to see the Platform.”

Joe winced a little. Then he grinned wryly.

“That cuts me down to size, eh?”

She smiled at him. But they both felt queer. They went on into the interior of the huge space ship.

“Lots of space,” said Joe. “This could’ve been smaller.”

“It’ll be nine-tenths empty when it goes up,” said Sally. “But you know about that, don’t you?”

Joe did know. The reasons for the streamlining of rockets to be fired from the ground didn’t apply to the Platform. Not with the same urgency, anyhow. Rockets had to burn their fuel fast to get up out of the dense air near the ground. They had to be streamlined to pierce the thick, resisting part of the atmosphere. The Platform didn’t. It wouldn’t climb by itself. It would be carried necessarily at slow speed up to the point where jet motors were most efficient, and then it would be carried higher until they ceased to be efficient. Only when it was up where air resistance was a very small fraction of ground-level drag would its own rockets fire. It wouldn’t gain much by being shaped to cut thin air, and it would lose a lot. For one thing, the launching process planned for the Platform allowed it to be built complete so far as its hull was concerned. Once it got out into its orbit there would be no more worries. There wouldn’t be any gamble on the practicability of assembling a great structure in a weightless “world.”

The two of them—and the way they both felt, it seemed natural for Joe to be helping Sally very carefully through the corridors of the Platform—the two of them came to the engine room. This wasn’t the place where the drive of the Platform was centered. It was where the service motors and the air-circulation system and the fluid pumps were powered. Off the engine room the main gyros were already installed. They waited only for the pilot gyros to control them as a steering engine controls an Earth ship’s rudder. Joe looked very thoughtfully at the gyro assembly. That was familiar, from the working drawings. But he let Sally guide him on without trying to stop and look closely.

She showed him the living quarters. They centered in a great open space sixty feet long and twenty wide and high. There were bookshelves, and two balconies, and chairs. Private cabins opened from it on different levels, but there were no steps to them. Yet there were comfortable chairs with straps so that when a man was weightless he could fasten himself in them. There were ash trays, ingeniously designed to look like exactly that and nothing else. But ashes would not fall into them, but would be drawn into them by suction. There was unpatterned carpet on the floor and on the ceiling.

“It’s going to feel queer,” said Sally, oddly quiet, “when all this is out in space, but it will look fairly normal. I think that’s important. This room will look like a big private library more than anything else. One won’t be reminded every second, by everything he sees, that he’s living in a strictly synthetic environment. He won’t feel cramped. If all the rooms were small, a man would feel as if he were in prison. At least this way he can pretend that things are normal.”

Her mind was not wholly on her words. She’d been frightened for Joe. And he was acutely aware of it, because he felt a peculiar after-effect himself.

“Normal,” he said drily, “except that he doesn’t weigh anything.”

“I’ve worried about that,” said Sally. “Sleeping’s going to be a big problem.”

“It’ll take getting used to,” Joe agreed.

There was a momentary pause. They were simply looking about the great room. Sally stirred uneasily.

“Tell me what you think,” she said. “You’ve been in an elevator that started to drop like a plummet. When the Platform is orbiting it’ll be like that all the time, only worse. No weight. Joe, if you were in an elevator that seemed to be dropping and dropping and dropping for hours on end—do you think you could go to sleep?”

Joe hadn’t thought about it. And he was acutely conscious of Sally, just then, but the idea startled him.

“It might be hard to adjust to,” he admitted.

“It’ll be hard to adjust to, awake,” said Sally. “But getting adjusted to it asleep should be worse. You’ve waked up from a dream that you’re falling?”

“Sure,” said Joe. Then he whistled. “Oh-oh! I see! You’d drop off to sleep, and you’d be falling. So you’d wake up. Everybody in the Platform will be falling around the Earth in the Platform’s orbit! Every time they doze off they’ll be falling and they’ll wake up!”

He managed to think about it. It was true enough. A man awake could remind himself that he only thought and felt that he was falling, and that there was no danger. But what would happen when he tried to sleep? Falling is the first fear a human being ever knows. Everybody in the world has at one time waked up gasping from a dream of precipices down which he plunged. It is an inborn terror. And no matter how thoroughly a man might know in his conscious mind that weightlessness was normal in emptiness, his conscious mind would go off duty when he went to sleep. A completely primitive subconscious would take over then, and it would not be satisfied. It might wake him frantically at any sign of dozing until he cracked up from sheer insomnia ... or else let him sleep only when exhaustion produced unconsciousness rather than restful slumber.

“That’s a tough one!” he said disturbedly, and noticed that she still showed signs of her recent distress. “There’s not much to be done about it, either!”

“I suggested something,” said Sally, “and they built it in. I hope it works!” she explained uncomfortably. “It’s a sort of blanket with a top that straps down, and an inflatable underside. When a man wants to sleep, he’ll inflate this thing, and it will hold him in his bunk. It won’t touch his head, of course, and he can move, but it will press against him gently.”

Joe thought over what Sally had just explained. He noticed that they were quite close together, but he put his mind on her words.

“It’ll be like a man swimming?” he asked. “One can go to sleep floating. There’s no sensation of weight, but there’s the feeling of pressure all about. A man might be able to sleep if he felt he were floating. Yes, that’s a good idea, Sally! It’ll work! A man will think he’s floating, rather than falling!”

Sally flushed a little.

“I thought of it another way,” she said awkwardly. “When we go to sleep, we go way back. We’re like babies, with all a baby’s fears and needs. It might feel like floating. But—I tried one of those bunks. It feels like—it feels sort of dreamy, as if someone were—holding one quite safe. It feels as if one were a baby and—beautifully secure. But of course I haven’t tried it weightless. I just—hope it works.”

As if embarrassed, she turned abruptly and showed him the kitchen. Every pan was covered. The top of the stove was alnico-magnet strips, arranged rather like the top of a magnetic chuck. Pans would cling to it. And the covers had a curious flexible lining which Joe could not understand.

“It’s a flexible plastic that’s heatproof,” said Sally. “It inflates and holds the food down to the hot bottom of the pan. They expected the crew to eat ready-prepared food. I said that it would be bad enough to have to drink out of plastic bottles instead of glasses. They hung one of these stoves upside down, for me, and I cooked bacon and eggs and pancakes with the cover of the pan pointing to the floor. They said the psychological effect would be worth while.”

Joe was stirred. He followed her out of the kitchen and said warmly—the more warmly because these contributions to the Space Platform came on top of a personal anxiety on his own account: “You must be the first girl in the world who thought about housekeeping in space!”

“Girls will be going into space, won’t they?” she asked, not looking at him. “If there are colonies on the other planets, they’ll have to. And some day—to the stars....”

She stood quite still, and Joe wanted

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