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)
Thursday, March 12, 2015
Good Walls Make for Good Neighbors
Today's Astronomy Picture of the Day shows a part of the North American Nebula in the constellation of Cygnus known as the Cygnus Wall.
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