I feel we should probably build massive rotating space stations first, instead of going to Mars.<p>At least with rotating space stations, we can generate 1 g of gravity, to simulate the Earth’s gravity.<p>And you’re still close to home, for when you get space sick.<p>I think if the Mars trip ends in the premature deaths of its inhabitants, because of reduced gravity, then this alone will cause the economic failure of the program.<p>But, alternatively, maybe the solution is to build a centrifuge on Mars, that will spin you around at 1 Earth Gravity. And maybe you need to sit inside this device for 1 hour a day, in order to get your Earth gravity needs.