To space-conscious laymen, the very word meteoroid is heavy with menace. It conjures up visions of rocklike objects streaking the sky as shooting stars, moving at such enormous speeds that a lump as big as a pea could punch a fist-sized hole through any spacecraft. Scientists, who have calculated the probability that a spacecraft and a meteoroid would collide, are less worried than laymen, but even so, they have planned on protecting long-range space vehicles with meteor bumpers. Now it seems that spacecraft will need no such shields. Space is indeed teeming with meteoroids, but most of them are fluffy...
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