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)
Thursday, March 16, 2017
Today's Astronomy Picture of the Day brings us the starlit face of Mimas. Another wonderful image courtesy of the hard-working Cassini orbiter!