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, March 21, 2014
Star Trails Over Rock Face
Today's Astronomy Picture of the Day shows star trails (time exposure) over the face of El Capitan in Yosemite National Park.
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