Science: Contamination Aloft

The possible troubles of space travelers are only the beginning of the space scientists' worries. There is a worrisome chance that moon-bound rockets will contaminate the earth's own atmosphere and cause serious difficulties for the men who stay behind.

The giant rockets designed to boost a man-carrying capsule to the moon will burn more than 2,000 tons of fuel, and a large part of their exhaust gases will be deposited more than 80 miles high, up where the air is only one-billionth as dense as at sea level. Once discharged at that altitude, the gases will not fall for weeks or months,...

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