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During the first year, NASA and its astronauts on board the station have sought primarily to test the module’s ability to withstand space debris—as a rapidly depressurized habitat would be a bad thing in space. And indeed, sensors inside the module have recorded “a few probable” impacts from micrometeoroid debris strikes, according to NASA’s Langley Research Center. Fortunately, the module’s multiple layers of kevlar-like weave have prevented any penetration by the debris.
They have also found that the cosmic ray dosage in the module seems comparable to the rest of the station. They are now using the module to test the radiation shielding capability of several different kinds of materials.