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, September 24, 2017
What's That?
Today's Astronomy Picture of the Day is a handy diagram to help you identify (in the broadest sense) what you're looking at in the sky!
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