HOUSTON — U.S. astronauts Rick Mastracchio and Steve Swanson are prepping for a 2-3-hr. contingency spacewalk outside the International Space Station (ISS), potentially on April 22, to replace a failed backup electronics box responsible for the operations of outstretched solar arrays, thermal control system components and the station’s mobile transporter. Noted during a scheduled April 11 check out by NASA’s Mission Control team, the multiplexer, demultiplexer (MDM) failure ...

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