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, March 3, 2013
Bubbles
In this installment of the NASA Image of the Day Gallery, the Hubble Space Telescope observes planetary nebula ESO 456-67.
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