Training for the Mission of a Lifetime
STS-121 mission specialist Piers J. Sellers, wearing a training version of the space suit used for extravehicular activity (EVA), participates in an EVA simulation while anchored to a training version of the shuttle's robotic arm in the Space Vehicle Mockup Facility at Johnson Space Center.
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https://www.nasa.gov/image-detail/training-mission-of-lifetime/
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