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)
Sunday, June 17, 2018
Today's dual image Astronomy Picture of the Day shows the global impact of dust storms on Mars. From 2001, a few months apart, all detail is wiped from these Hubble Space Telescope pictures.