we have to pay for expensive trips into space, not only money but also our health.
all of which will produce end-rewarding results, albeit full of risk, human curiosity finally overcame the fear of all bad risks, we are not too late to realize it. with the rapidly evolving technology is only a matter of time for us to reduce or perhaps eliminate all the bad things there.
RE: Radiation on our way to and on MARS - Colonization of MARS Series