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)
Friday, May 13, 2016
Double Transit
Today's Astronomy Picture of the Day shows both the International Space Station and fleet Mercury crossing the face of the Sun!
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