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, March 9, 2015
Today's Astronomy Picture of the Day is a great demonstration of gravitational lensing. The light of a distant supernova is bent around a far galaxy and appears as four "separate" supernovas.