'no long term future for us in space without something like artificial gravity.' and without an answer to the radiation problem. http://www.wired.com/2014/04/r

'no long term future for us in space without something like artificial gravity.' and without an answer to the radiation problem. http://www.wired.com/2014/04/radiation-risk-iss-mars/ http://www.wired.com/2014/04/radiation-risk-iss-mars/