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)
Friday, October 25, 2019
Today's Astronomy Picture of the Day shows nebula in the constellation of Cassiopeia, IC 59 (on the left) and IC 63 (on the right). Look fast, they won't be around forever (thanks to cosmic erosion).