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, February 3, 2019
Arch
Today's Astronomy Picture of the Day brings us the arch of the Milky Way over the skies of Utah. The scene is disturbed by a glow. A city? No, "airglow", a chemical reaction that is ramped up in this case by gravity waves creating the patterns in the sky. "Mouseover" the image in the link to get a constellation guide.
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