Astronauts prepare for spacewalk to fix ISS

(CNN) - Two NASA astronauts are preparing for a spacewalk to fix the International Space Station. NASA says the crew will replace a faulty pump module.

The first space walk is scheduled for Saturday morning, and a second for Monday. NSASA says, if necessary, a third could be scheduled for Christmas Day.The spacewalks are expected to last about 6 and-a-half hours.


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