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)
Sunday, November 4, 2018
A look at current and planned large professional ground-based astronomical instruments. Having grown up with the 200-inch Hale Telescope as "state of the art", this boggles my mind.