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)
Tuesday, September 17, 2013
Ellipse and Rays
An elliptical crater on Mercury, imaged by MESSENGER. The rays indicate a "young" crater (in terms of geological measure).
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