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 17, 2017
Messier's Gems
Today's Astronomy Picture of the Day is a "stacked image" (ground and space-based telescopes contributing) of Messier 81, a striking spiral galaxy in Ursa Major.
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