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, May 14, 2018
Today's Astronomy Picture of the Day shows Saturn's icy moon Hyperion. Somewhat potato-shaped, it has the appearance of a sponge or a piece of pumice.