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, September 26, 2017
Today's Astronomy Picture of the Day brings us a parting gift. As it fell towards the end of its mission, the Cassini Orbiter snapped one final whole-ring image of Saturn.