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, September 23, 2014
The Quiet Sky
Today's Astronomy Picture of the Day depicts a wonderful night sky. Aurora, a light pillar from a volcano, backlit clouds and the night stars ("mouseover" for some constellation guidance).