Chris Williams and Jessica Meir replaced a faulty wrist joint on the International Space Station's robotic arm during a complex mission carried out while the orbiting laboratory travelled around Earth at nearly 28,000 kmph. Two NASA astronauts successfully completed a critical spacewalk outside the International Space Station on Tuesday, replacing a malfunctioning wrist joint on the station's Canadarm2 robotic arm. Chris Williams and Jessica Meir spent 7 hours and 20 mi... [2121 chars]
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