“But there are plenty of challenges to overcome first. To camp on the moon, astronauts need to be shielded from solar radiation. In a waterless environment every drop of H2O, including sweat and urine, must be recycled and purified. NASA engineers are sorting through dozens of possible models for the lunar outpost—from horizontal, aluminum cylinders to inflatable structures that are essentially giant, Kevlar-reinforced balloons.” [Smithsonian]
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