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, June 19, 2018
Life Below—Life Above?
Today's Astronomy Picture of the Day shows stromatolites (today's version of a very ancient life form) in Australia under the arch of the Milky Way. Are there planets out there that support a similar form of life?