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, October 18, 2015
Cotton
Today's Astronomy Picture of the Day doesn't go as far "up" as yesterday's: here we see so-called mammatus clouds photographed over Saskatchewan, Canada in 2012.
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