Spacewalk On Christmas Eve For US Astronauts

Two space station astronauts have begun a Christmas Eve spacewalk in hopes of wrapping up urgent cooling system repairs.

The ISS flies about 250 miles above Earth. Pic: Nasa

It is the second spacewalk in four days for US astronauts Rick Mastracchio and Michael Hopkins.

The pair removed a faulty ammonia pump at the International Space Station during Saturday's outing.

Today, they are to install a new ammonia pump in what is hoped will be the final fix at the system.

Images from the spacewalk on Saturday. Pic: Nasa

The spacewalk is expected to last about six hours. It had been originally planned for Monday, but a suit problem prompted NASA to delay it by one day.

It is only the second Christmas Eve spacewalk in NASA history.

The external cooling line - one of two - shut down on December 11.

It is only the second Christmas Eve spacewalk in NASA history. Pic: Nasa

The six-man crew had to turn off all nonessential equipment, including experiments.

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