ISS astronauts perform maintenance tasks and upgrades

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Two astronauts have ventured outside the International Space Station to perform maintenance tasks and upgrades.

US astronaut Suni Williams and Japanese astronaut Aki Hoshide spent more than six hours outside the station.

The primary objectives were to replace a faulty power relay unit, rig power cables for the arrival late next year of a Russian laboratory module and replace a failing robotic arm camera.

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