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 9, 2014
Hole In One
Today's Astronomy Picture of the Day shows us the side of Pavonis Mons, one of several large martian volcanoes. A meteor punctured the side of the volcano, opening up access to what appears to be a cavern. What might lie beneath?
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