The Mars Rover Curiosity arrived on Mars last year but the Mars Science Laboratory mission was already at work during its interplanetary journey. Curiosity has traveled within a spaceship just as human astronauts would therefore it was fitted with the Radiation Assessment Detector (RAD) instrument in order to measure the amount of radiations absorbed in the course of the journey. The analysis of the data received indicate that they’re exceeding the limits for astronauts during their whole career.