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 22, 2017
Dance of the Schwarzchild Radius
Today's Astronomy Picture of the Day peers into the heart of active galaxy 3C 75. Two supermassive black holes do a gravitational dance that probably will not end well for the parent galaxy.
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