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, January 18, 2019
Observatory Trails
Today's Astronomy Picture of the Day shows star trails seemingly rotating around an axis fixed in the dome of an astronomical observatory.
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