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, December 14, 2014
The Black Cloud
Today's Astronomy Picture of the Day shows Barnard 68, a molecular black cloud in the constellation of Ophiuchus. A hole in space? No, a cloud of darkness leading eventually to light.