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, May 24, 2014
Circumhorizontal
Today's Astronomy Picture of the Day shows an atmospheric phenomena that I've never seen (or heard of) before: a circumhorizontal arc, clouds acting as prisms, and creating a "horizontal rainbow"!
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