Astronauts On Spacewalk To Install Computer

Two astronauts are embarking on a brief spacewalk to carry out repairs at the International Space Station (ISS).

American astronauts Rick Mastracchio and Steve Swanson are spending around 2.5 hours on the spacewalk to remove and replace a computer, known as a multiplexer/demultiplexer (MDM).

The 10-year-old MDM, one of 45 on board the ISS, broke down after a routine restart operation last month.

The spacewalk, which is being streamed live by Nasa, is the 179th from the orbiting laboratory.

The astronauts will spend 2.5 hours away from the ISS

Just before the walk, a Russian cargo capsule Progress 53 undocked from the ISS for a two-day test of a new system which enables it to reattach itself automatically.

The unmanned spacecraft will travel around 311 miles (500km) away from the ISS.

"It will return back to the Zvezda docking port Friday morning after Russian flight controllers have tested its new Kurs automated rendezvous system," the US space agency said.

A similar operation was carried out in 2012 when another Progress cargo freighter pulled away from the station and redocked.

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