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)
Tuesday, March 19, 2013
A Different Moon
Today's Astronomy Picture of the Day shows a full hemisphere of our Moon, as viewed by the data collected by the twin GRAIL orbiters, Ebb and Flow.