Former astronaut doubts that NASA or SpaceX will make it to Mars with their shiny new rockets

It's widely known that the next frontier for manned space flight is Mars. It's our closest planetary neighbor that actually makes sense to visit, and we know more about the makeup of Mars than we do about any other planet. Scientists think a Mars settlement is entirely possible at some point in the future, and we even think we might be able to farm there. However, we need to actually get there first, and at least one former astronaut doesn't see that happening any time soon. Chris Hadfield, who ...