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, August 24, 2014
An Obscured Dot
Today's Astronomy Picture of the Day shows a strange speck on the Sun. Sunspot? No, Mercury transiting across the face of the Sun, obscured by terran clouds.