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, September 7, 2015
Today's Astronomy Picture of the Day shows the Shark Nebula in the constellation of Cepheus in the circum-polar skies of the northern hemisphere. "Mouseover" the image for a guide to the different parts of the nebula. Any Jets? Or jets?