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)
Friday, July 21, 2017
Satellite
Today's Astronomy Picture of the Day is a image courtesy of the Hubble Space Telescope showing Mars and a surprise visitor.
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