A Fall of Moondust

Despite all the claims of the manufacturers, no one can function efficiently in a space suit for more than twenty-four hours, for several obvious reasons, and several that are not so obvious. There is, for example, that baffling complaint known as spaceman's itch, affecting the small of the back—or even less accessible spots—after a day's incarceration in a suit. The doctors claim that it is purely psychological, and several heroic space medicos have worn suits for a week or more to prove it. The demonstration has done nothing to affect the incidence of the disease.

The mythology of space suits is a vast, complex, and frequently ribald subject, with a nomenclature all of its own. No one is quite sure why one famous model of the 1970's was known as the Iron Maiden, but any astronaut will gladly explain why 2010's Mark XIV was called the Chamber of Horrors. There seems little truth, however, in the theory that it was designed by a sadistic female engineer, determined to inflict a diabolical revenge upon the opposite sex.

But Lawrence was reasonably at ease in his model, as he listened to these enthusiastic amateurs put forward their ideas. It was just possible—though very unlikely—that one of these uninhibited thinkers might come up with an idea that could be of practical use. He had seen it happen before, and was prepared to listen to suggestions rather more patiently than Dr. Lawson—who, it was obvious, would never learn to suffer fools gladly.

He had just demolished an amateur engineer from Sicily , who wanted to blow the dust away by means of strategically placed air jets. The scheme was typical of those put forward; even where there was no fundamental scientific flaw, most of these ideas fell to pieces when examined quantitatively. You could blow the dust away—if you had an unlimited supply of air. WThile the voluble flow of Italian-English was proceeding, Lawson had been doing some rapid calculations. “I estimate, Signor Gusalli,” he said, “that you would need at least five tons of air a minute to keep open a hole large enough to be useful. It would be quite impossible to ship such quantities out to the site.”

“Ah, but you could collect the air and use it over and over again!”

“Thank you, Signor Gusalli,” cut in the firm voice of the master of ceremonies. “Now we have Mr. Robertson from London , Ontario . What's your plan, Mr. Robertson?”

“I suggest freezing.”

“Just a minute,” protested Lawson. “How can you freeze dust?”

“First I'd saturate it with water. Next I'd sink cooling pipes and turn the whole mass into ice. That would hold the dust in place, and then it would be easy to drill through it.”

“It's an interesting idea,” admitted Lawson, rather reluctantly. “At least it's not as crazy as some that we've had. But the amount of water needed would be impossibly large. Remember, the cruiser is fifteen meters down—”

“What's that in feet?” said the Canadian, in a tone of voice that made it clear that he was one of the hard-core antimetric school.

“Fifty feet—as I'm sure you know perfectly well. Now you'd have to deal with a column at least a meter across—yard, to you—so that would involve—ah—approximately fifteen times ten squared times ten to the fourth cubic centimeters, which gives—why, of course, fifteen tons of water. But this assumes no wastage at all; you'd really need several times as much as this. It might come to as much as a hundred tons. And how much do you think all the freezing gear would weigh?”

Lawrence was quite impressed. Unlike many scientists he had known, Lawson had a firm grasp of practical realities, and was also a rapid calculator. Usually when an astronomer or a physicist did a quick computation, his first attempt was out by a factor of anything from ten to a hundred. As far as Lawrence could judge, Lawson was always right the first time.

The Canadian refrigeration enthusiast was still putting up a fight when he was dragged off the program, to be replaced by an African gentleman who wanted to use the opposite technique—heat. He planned to use a huge concave mirror, focusing sunlight on the dust and fusing it into an immobile mass.

It was obvious that Lawson was keeping his temper only with the utmost difficulty; the solar-furnace advocate was one of those stubborn,a self-taught “experts” who refused to admit that he could possibly have made an error in his calculations. The argument was getting really violent when a voice from much closer at hand cut across the program.

“The skis are coming, Mister Lawrence.”

Lawrence rolled into a sitting position and climbed aboard the raft. If anything was already in sight, that meant it was practically on top of him. Yes, there was Duster One—and also Duster Three, which had made a difficult and expensive trip from the Lake of Drought , the Sea's smaller equivalent on Farside. That journey was a saga in itself, which would remain forever unknown except to the handful of men involved.