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This July 19, 2011, photo of the International Space Station was taken from the space shuttle Atlantis after it left the orbiting complex. (NASA via AP)

NASA ordered up urgent spacewalking repairs at the International Space Station


Two NASA astronauts will venture out of the International Space Station on Tuesday to replace a data relay box that failed over the weekend. 

The broken data relay box, known as a Multiplexer-Demultiplexer (MDM), was one of two that was responsible for controlling the station's radiators, solar panels, cooling loops and other systems. 

"The crew has never been in any danger and the MDM failure, believed to be internal to the box itself, has had no impact on station activities," NASA said in a statement.  

Space station managers decided Sunday that astronauts Peggy Whitson and Jack Fischer will do an approximately two-hour spacewalk to replace the failed unit with an on-board spare. 

The two astronauts went spacewalking nearly two weeks ago but were cut short because of a leaky umbilical hose inside the space station. 

If everything goes as planned on Tuesday, Fischer will also hook up wireless communications antennas outside the orbiting lab. 

Whitson's spacewalk will also tie the record for most spacewalks by a U.S. astronaut. 

Tuesday's spacewalk is scheduled to begin around 8 a.m. and will be broadcast on NASA TV, according to USA Today

The Associated Press contributed to this report. 

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