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, July 3, 2014
Beyond the Wall
Today's Astronomy Picture of the Day is a detail of the complex nebula structures in the constellation of Cygnus. Known as the Cygnus Wall, it is part of a more well-known structure, The North American Nebula (featured in a science fiction story written to celebrate a certain countries bicentennial a few years ago).
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