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, September 28, 2014
Shall We Dance?
Today's Astronomy Picture of the Day shows two supermassive black holes locked in a death dance at the center of active galaxy 3C 75. When they merge, it will not be gentle, but a heck of a bang.