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, July 19, 2018
Bright Focus
Today's Astronomy Picture of the Day focuses in on Cerealia Facula, on Dwarf Planet Ceres. As the Dawn vehicle reaches the end of its mission (fuel supplies are not infinite!), it has been put into a lower orbit around Ceres to make the most of the remainder of the mission. The object seen is (alas) not ice (as I had hoped) but deposits of salt (15 kilometers wide)
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