Using a robotic arm, an astronaut does maintenance work on Hubble. In the top third of the picture, Earth is seen in the background.

Hubble SM4 EVA

Perched on the end of the RMS, astronaut Andrew Feustel, mission specialist, performs work on the Hubble Space Telescope during the fifth servicing mission (SM 4), kicking off a week's work on the orbiting observatory.

Credits: NASA
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Image CreditNASA
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