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 28, 2015
Today's Astronomy Picture of the Day shows NGC 4945, a edge-on spiral galaxy in the constellation of far Centaurus. What beats at the center of this galaxy?