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)
Monday, September 16, 2013
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Today's Astronomy Picture of the Day is actually a short video showing something that we can't see: a rotating Moon. Images from the Lunar Reconnaissance Orbiter are put together to give us the total view.