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)
Thursday, May 30, 2019
Copernicus at Dawn
Today's Astronomy Picture of the Day shows Copernicus Crater, one of the easier craters to spot with the "naked eye" (along with Tycho) on the lunar nearside. Hey, let's go explore and do some mountaineering!