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)
Saturday, October 27, 2018
Green Skies at Night, Sailor's Delight
Today's Astronomy Picture of the Day shows auroral skyglow caused by energized atmospheric oxygen in the skies above the Canadian Rockies.
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