Why is a mission to Mars more radiation-intensive than a stay on the ISS?
Answer
Mars missions leave the protective bubble of Earth's magnetic field entirely
Operating within low-Earth orbit, such as on the International Space Station, allows spacecraft to remain partially shielded by the Earth's magnetic field, or magnetosphere, which filters out a significant portion of harmful cosmic energy. A mission to Mars requires traveling deep into space, completely exiting this protective environment. Consequently, astronauts on such journeys are exposed to an unshielded, constant barrage of galactic cosmic rays for the duration of the trip, leading to significantly higher estimated radiation doses compared to missions near Earth.
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