STS-131s spacewalkers, Rick Mastracchio and Clay Anderson spent most of their fifth day in space working outside the International Space Station on a six-and-a-half- hour EVA. They completed important tasks such as retrieving a science experiment on the Japanese Kibo Laboratorys exposed facility, replacing a rate gyro assembly on the center segment of the stations truss and the removal of an ammonia tank used to help cool the station from its assembly outside the complex.
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