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, February 11, 2017
Today's Astronomy Picture of the Day looks back at the neighborhood. In 1990, Voyager 1 looked back one last time and showed us where we are.