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At right, the Canadarm2 robotic arm maneuvers the Earth Surface Mineral Dust Source Investigation, or EMIT, after retrieving it from the trunk of the SpaceX Dragon cargo craft. EMIT was installed on ExPRESS Logistics Carrier-1 (top center) on the port side of the International Space Station's truss structure. The station's main solar arrays are also seen extending from the port truss segment. EMIT is a mineral dust source observation experiment that explores the Earth’s mineral dust cycle.