More data must be gathered on the dangers of space radiation before a determination can be made as to whether a manned mission to Mars is feasible with current technology, according to Frank Cucinotta, NASA Johnson Space Center's manager for radiation health. Space radiation comes from cosmic rays emitted by the sun and other stars beyond our solar system. Unlike Earth, Mars does not have a global magnetic field or a thick atmosphere to shield it from these rays. Cucinotta also ...


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