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)
Wednesday, September 24, 2014
The Worlds of Galileo
Today's Pluto Picture of the Day shows the four Galilean moons of Jupiter as imaged during the New Horizons gravity boost flyby.