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, March 24, 2017
Today's Astronomy Picture of the Day features an owl and galaxy and a local interloper. Comet 41P/Tuttle–Giacobini–Kresak encounters galaxy Messier 108 and nebula Messier 97 (the "Owl Nebula").