HOUSTON — Two U.S. astronauts were preparing for a possible May 11 spacewalk outside the International Space Station (ISS) in response to a significant ammonia coolant leak in the thermal control system radiator of the orbiting lab’s oldest solar power module. The NASA-led ISS Mission Management Team had scheduled a meeting for late May 10 to consider final approval for a 6-7-hr. extravehicular activity (EVA) to replace the suspected source of the leak, a pump and flow control system ...


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