Watch live as MI astronaut spacewalks outside International Space Station

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A pair of NASA astronauts aboard the International Space Station are embarking on a six-and-a-half-hour spacewalk today to upgrade and fix the orbiting outpost.

Two NASA astronauts have successfully completed the fifth spacewalk of this year aboard the International Space Station, spending 6 hours, 31 minutes to undertake maintenance operations on the orbital outpost.

Ammonia coolant is toxic, and Mission Control repeatedly warned the spacewalkers to be careful of any leaks. They need to rearrange the space station's external cooling system by swapping the positions of two spare ammonia pumps.

Drew Feustel and Ricky Arnold wrapped up their spacewalk at 2:10 p.m.

"The goal of the pump flow control subassembly is all about the cooling batteries that the space station holds its electrical power in", explained Anthony Vareha, a flight director at NASA.

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"As a result the worry is that that pump got a bit cold and henceforth it was named 'Frosty, '" said Vareha.

Frosty took Leaky's spot on a robot-arm mechanism, while Leaky was moved to a long-term storage platform. The other, a failed unit dubbed Leaky, spewed out ammonia five years ago.

"It is something that we are very respectful of because we don't want that coming inside the vessel on the suits at the end of the spacewalks", Vareha said.

The astronauts taking part in the NASA space walk are no strangers to the task, with this being the eighth of Feustel's walks as well as the fourth of Arnold's.

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