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)
Saturday, January 30, 2016
Today's Astronomy Picture of the Day shows five (well, six!) members of the Solar System scattered across the view. Can you spot planet six?