Endeavor astronauts finished fourth spacewalk

In the course of work, which lasted 7 hours and 12 minutes and ended at 01:06 Moscow time on Saturday, Chris Cassidy (Chris Cassidy) and Tom Marshbern (Tom Marshburn) replaced four of the six batteries ISS.

All six batteries be replaced at the last exit into open space, but due to the fact that he lasted less than the scheduled time, the astronauts were able to mount only two of them. The reason why the crew members on board the shuttle returned to the ISS earlier than scheduled, was the increase of carbon dioxide in the system life-suit Cassidy.

The fourth exit into space extended in accordance with the planned time. In a career both astronauts, this is the second output, said NASA.

As part of the mission «Endeavor», which was launched only from the sixth attempt, and docked to the ISS on 17 July, remains only one way out into open space.