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, December 18, 2018
Today's Astronomy Picture of the Day shows frozen bubbles of methane trapped in the ice of Lake Baikal in Russia. Astoundingly, the lake contains 20% of the world's fresh water.