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)
Saturday, March 3, 2018
Grooves and Rilles
Today's Astronomy Picture of the Day was taken during the journey of Apollo 8 and shows features within craters in Mare Fecunditatis.
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