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)
Tuesday, March 13, 2018
Mirrorverse
Today's Astronomy Picture of the Day takes us around the plane of the Milky Way by combining images from the northern and southern hemispheres.
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