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, August 6, 2015
Today's Astronomy Picture of the Day is of a pair of Plutonian images, slightly shifted. Combined (crossing your eyes, perhaps) you can see a stereo view of Pluto.