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)
Monday, March 19, 2018
Today's Astronomy Picture of the Day shows the Nebra Sky Disk, a Bronze Age artifact that seems to depict the sky, including the Pleiades. "It's origin and purpose remain a mystery."