Two Nasa astronauts stepped outside the International Space Station to replace a faulty Canadarm2 wrist joint. The repair is aimed at restoring a vital robotic arm used for cargo operations, maintenance and astronaut support. Two Nasa astronauts are currently outside the International Space Station (ISS), carrying out a critical spacewalk to repair one of the orbiting laboratory's most important robotic systems, while flying at a speed of 28,000 kilometers per hour. Nasa ... [2162 chars]
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