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)
Thursday, April 21, 2016
Should a crewed expedition to Mars actually go to Phobos instead? What would be the advantages? The disadvantages? There's no money in it yet (let alone tin being bent), but people are (again) thinking about this.