
Image: ESA astronaut Luca Parmitano (middle) and NASA astronaut Drew Morgan (left) work on get-ahead tasks during the fourth spacewalk to service the Alpha Magnetic Spectrometer (AMS). Saturday's spacewalk, which lasted five hours and 55 minutes, was the last in a four-part series to extend the life of the particle physics detector that was not designed to be maintained in space. Installed on the outside of the International Space Station in 2011, the instrument out-lived its three-year mission ...
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