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, April 22, 2017
Everyone you know is encompassed in today's Astronomy Picture of the Day. Cassini snaps an image of Earth captured in the ring gaps of Saturn.