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)
Wednesday, January 29, 2014
Will Comet C/2013 A1 Siding Spring buzz Mars and provide orbiting craft and ground vehicles there with a nice show? Or will it come even closer and throw up dust hazards (from the comet) or even impact?