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, January 31, 2016
Today's Astronomy Picture of the Day appears to be an odd sight in the sky. MWC 922 appears to be a square when viewed by a telescope. What causes a nebula to take an (apparent) shape like this?