NASA astronauts on the space station are preparing for a spacewalk to repair a robotic arm as safety advisers raise concerns about its long-term health. WASHINGTON — NASA astronauts on the International Space Station are preparing for a spacewalk to repair a robotic arm as safety advisers raise concerns about the long-term health of the station and spacesuits. Astronauts Jessica Meir and Chris Willia... [4596 chars]
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