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, July 26, 2019
Tracery
Today's Astronomy Picture of the Day shows delicate cloud tracery across the sky as noctilucent clouds move over Sweden.
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