Mars astronauts safe from radiation New Zealand Herald

Humans could survive an extended visit to Mars without dying of radiation exposure. A study of the cosmic rays bombarding the planet says a space colony should be able to shield itself from any radiation, thus escaping significant increases in the risk of cancer or other radiation-induced diseases. Although it may be many years before there is a manned mission to Mars, scientists are already assessing what needs to be done for such a return trip to work.