In this photo provided by NASA, astronaut Rick Mastracchio works to replace a pump in a spacesuit, Monday, April 14, 2014, aboard the International Space Station. SpaceX called off a launch to the space station on Monday, April 14, 2014, because of a rocket leak. Officials said they believe the problem can be fixed by Friday, the next opportunity for flying and the last chance before astronauts do urgent spacewalking repairs. (AP Photo/NASA)
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