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)
Tuesday, December 19, 2017
Polar Spiral
Today's Astronomy Picture of the Day is a view generated from images provided by NASA's Mars Global Surveyor (still going!) and ESA's Mars Express. "Dry ice" (frozen carbon dioxide) and "water ice" (what you are more
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