Two astronauts servicing Hubble using a robotic arm. Clouds above Earth's surface behind the telescope create the background.

Hubble SM 4 EVA

On the fifth and final servicing mission (SM 4), astronauts John Grunsfeld (back) and Andrew Feustel (front) work to remove and replace the Hubble Space Telescope's Fine Guidance Sensor 2.

Credits: NASA
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Image CreditNASA
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