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Observatory #4

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OBS4 Image 5

Technicians and Engineers carefully maneuver the Propulsion/Thrust Tube module onto the spacecraft deck, completing one more step in a series of major milestones for spacecraft integration. Although this is #4 (identified by the purple ribs on the thrust tube), it is the third MMS spacecraft to be assembled. Observatory #3 will be the last one built in this fleet of four.