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NASA Flight Engineer Kate Rubins and Sochi Noguchi, an astronaut from the Japan Aerospace Exploration Agency, conduct a spacewalk near the International Space Station.
During the 72nd Walk, the astronauts will need to remove and replace the wireless video transceiver, as well as ventilate the ammonia circuit (early ammonia system) that is part of the ISS cooling system, among other tasks.
The walk is expected to last About six and a half hours.