SM2: Fine Guidance Sensor (FGS) Setup
One of Hubble's Fine Guidance Sensors is being exchanged by astronaut Gregory J. Harbaugh during the Servicing Mission 2. Gregory J. Harbaugh on the arm w/the Fine Guidance Sensor (FGS).
Image Credit: NASA
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https://science.nasa.gov/image-detail/sm2-fine-guidance-sensor-fgs-setup/
Image CreditNASA
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