2 astronauts did a spacewalk to address ammonia leaking from the International Space Station . They inspected the site of the leak and replaced a pump controller box on the orbiter . Afterward , initial tests showed no sign of a continuing leak , which was spotted Thursday , . They 'll eventually be joined by NASA astronaut Karen Nyberg , Russian cosmonaut Fiyodor Yurchikhin and European Space Agency astronaut Luca Parmitano , who are due to launch aboard a Russian Soyuz spacecraft on May 28 . The crew also performed maintenance work that included replacing an oxygen sensor in one of the station's two solar arrays with new equipment designed for longer life spans.
2 astronauts did a spacewalk to address ammonia leaking from the International Space Station . They inspected the site of the leak and replaced a pump controller box on the orbiter . Afterward , initial tests showed no sign of a continuing leak , which was spotted Thursday , . The crew also performed maintenance work that included replacing an oxygen sensor in one of the station's two solar arrays with new equipment designed for longer life spans.