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)
Wednesday, October 17, 2018
Dense Packing
Today's Astronomy Picture of the Day shows Messier 15, a globular star cluster which circles the Milky Way, out in the direction of the constellation of Pegasus.
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