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)
Sunday, May 19, 2013
Circular Motion
Today's Astronomy Picture of the Day takes us to our own planet. What caused this strange feature on the surface of our world?
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