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, May 12, 2017
Summer Cluster
Today's Astronomy Picture of the Day is one of my favorite summer sights: The Great Cluster Messier 13 in Hercules.
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