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, April 11, 2013
Today's Astronomy Picture of the Day combines a daytime shot of a cityscape with a nighttime shot of the sky. If only everybody dimmed their lights and such skies really were visible from a city!