Two American astronauts have replaced a large pump controller box outside the International Space Station that may be the source of an ammonia leak in the orbiting laboratory’s power cooling system.
Astronauts Chris Cassidy and Tom Marshburn removed the 113-kilogram box and replaced it with a spare about two-and-a-half hours into their spacewalk, according to the U.S. space agency NASA.
Engineers said they do not see any new signs of a leak and are very happy. But they warned it …
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