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)
Monday, June 29, 2015
Today's Astronomy Picture of the Day is a short video showing a sunspot group parading across the face of the Sun. More auroral activity in the offing?