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)
Thursday, May 30, 2013
Today's Astronomy Picture of the Day shows NGC 4725, a single spiral armed galaxy in the constellation of Coma Berenices. Why does this galaxy only have one spiral?