On Christmas Eve Expedition 42 Flight Engineer Terry Virts of NASA works to install new components in the station's Major Constituent Analyzer (MCA) located inside the US Lab. The MCA is used to measure the makeup of the astronaut's atmosphere onboard the orbiting laboratory.
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NASA
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On Christmas Eve Expedition 42 Flight Engineer Terry Virts of NASA works to install new components in the station's Major Constituent Analyzer (MCA) located inside the US Lab. The MCA is used to measure the makeup of the astronaut's atmosphere onboard the orbiting laboratory.