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, June 1, 2014
Cat's Eye
Today's Astronomy Picture of the Day shows NGC 6532, the Cat's Eye Nebula (in the constellation of Draco. In this image, the familiar nebula is surrounded by expanding shells of gas thrown off by the central star.
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