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, December 31, 2017
Free Falling
Today's Astronomy Picture of the Day shows Astronaut Bruce McCandless II testing the Manned Maneuvering Unit during a mission of Space Shuttle Challenger in 1984. The closest we came to a Robert McCall orbital work site?
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