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)
Tuesday, March 14, 2017
Today's Astronomy Picture of the Day shows a composite of visible stars and enhanced nebula in the winter skies. "Mouseover" the image in the link for a guide.