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)
Tuesday, August 8, 2017
Ring Waves
Today's Astronomy Picture of the Day brings us density waves in the Rings of Saturn, courtesy of Cassini. I'm going to miss that vehicle!
That is truly mesmerizing.
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