Rounding off the passenger list will be two more surprising travelers. Women generally have a higher risk of developing cancer, since they have more radiation-sensitive organs such as ovaries and breast tissue. Scientists say that different organs have different susceptibility to space radiation, and understanding that will be essential to long-term space exploration. One will be wearing a radiation protection vest and the other won’t. They will be fitted with some 5,600 sensors and 34 radiation detectors to measure the amount of radiation exposure they encounter during the mission. The dummies have torsos made of materials that mimic a woman’s softer tissue, organs and bones. Two other mannequins named Helga and Zohar will sit in the Orion’s passenger seats, and they reflect Nasa’s determination that a manned flight to the moon will soon include a woman. Of the 24 astronauts who have so far travelled to the moon - 12 of them walking on its surface - all were men, and Nasa wants to widen the diversity of its space crews. In Greek mythology, Artemis is the twin sister of Apollo, and Nasa clearly chose a goddess for a reason. The crew’s seats are mounted on an energy-dampening system to provide a smoother journey - two sensors placed behind the commander’s seat and under the headrest will record the acceleration and vibration generated throughout the mission, and the mannequin itself is equipped with two sensors to measure radiation exposure. In the commander’s seat will be strapped Commander Moonikin Campos - a tribute to electrical engineer Arturo Campos, who played a key role in getting the troubled Apollo 13 mission safely back to Earth in 1970
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