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 2, 2019
In the Bullseye
Today's Astronomy Picture of the Day: Riding over our blue planet, the International Space Station spots the ancient site of an impact site. Watch the skies.