These great hollow globes of artificial super-metals, and artificial transparent adamant, ranged in size from the earliest and smallest structures, which were no bigger than a very small asteroid, to spheres considerably larger than the Earth. (Olaf Stapledon, STAR MAKER)
Wednesday, December 20, 2017
Microcleansing
Today's Astronomy Picture of the Day is a short video showing how one washes one's hair in microgravity. Personal hygiene is complicated in that environment (and leads to wider issues from plumbing to supplies to recycling). Something mundane can have wide-ranging implications for an extended mission (long term stays on the Moon or a journey to Mars).
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