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 8, 2014
Today's Astronomy Picture of the Day shows open cluster NGC 290 in the constellation of Crux. "Open cluster" sounds dull compared to, say, a globular cluster. Wait until you click through...