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, October 3, 2014
Frozen Heck
So, what is the surface of Pluto made up of? Today's Pluto Picture of the Day gives us some hints.
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