HOUSTON — NASA astronauts Rick Mastracchio and Steve Swanson will be prepared for a 2-3 hr. spacewalk to replace a failed backup computer control box outside the International Space Station (ISS) as soon as April 20, ISS mission managers announced April 16. Problems with the 50-lb. multiplexer-dimultiplexer (MDM)—involved in the operation of the station’s outstretched solar panels, thermal control system and mobile transporter—were detected April 11, three days prior ...

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