"Because NASA is legally and ethically obligated to protect astronauts from radiation exposure to the greatest extent that is practical, the radiation health risks cannot be ignored. However, they should also not be exaggerated or overstated, as was the case in the AP article. The uncertanties in risk estimates do not indicate that the current estimates are either too high or too low, only that further research into, and knowledge of, the health effects of the GCR are needed before NASA could approve sending humans to Mars. "

What kind of type of steps (or proposals) are NASA considering which would increase our knowledge in this area?