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)
Thursday, May 31, 2018
The Expanse
Today's Astronomy Picture of the Day shows the expanse of stars in NGC 6744. 175,000 light years wide (24,000 light years in this image), how many civilizations are we looking at? (How many highly-rated SF TV shows are looking to be renewed?)
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