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Estimated Radiation Dosage on Mars Estimated Radiation Dosage on Mars - The colors in the map refer to the estimated annual dose equivalent in rems, a unit of radiation dose.  The range is generally from 10 rems(color-coded dark blue) to 20 rems (color coded dark red).  Radiation exposure for astronauts on the International Space Station in Earth orbit is typically equivalent to an annualized rate of 20 to 40 rems. Could human live in this dangerous environment? Source: - map realized by NASA's Mars Odyssey on 1 March 2002 Image credit jpl.nasa.gov