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)
Monday, December 15, 2014
Perfect Sphere
Today's Astronomy Picture of the Day shows a "gravity map" of our blue marble, popuarly known as the Potsdam Gravity Potato.
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