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, October 22, 2019
In the Mirror
Today's Astronomy Picture of the Day shows the night sky reflected in the world's largest mirror: a 130 kilometer wide salt lake covered temporarily by a reflective layer of water.