Now that exploration has moved beyond
planet earth, there are new challenges that must be considered. If
things go wrong, what resources are available in space? At least with
the explorers of the early world, a steady supply of air was a
resource no one ever questioned. Even if a sailor, like Magellan,
faced the open seas for endless months, food could be obtained from
the sea. Less obvious challenges, like the dust of a new planet,
might also present serious problems to planetary
explorers--astronauts that landed on the moon faced complications
caused by the fine "moon dust" that coated their boots and
gummed-up their space-suit joints, spreading inside the capsule for
the ride home. The stuff became airborne and "smelled like
gunpowder," giving the astronauts a sort of lunar hay-fever. It
was later discovered that this fine dust was similar to silica, which
is dangerous to human lungs, much like the silicosis over 16,000
miners have died from.
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