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)
Friday, January 8, 2016
In Saturn Space
Today's Astronomy Picture of the Day brings us a Cassini orbiter image of Saturn's "shepherd moon" Prometheus and the ghostly F Ring beyond.