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)
Saturday, July 12, 2014
Thanks to the long missions of various orbiters, we continue to see Mars evolve from being a "dead planet" to one where active processes shape the surface. Are gullies formed by dry ice?