Two US astronauts floated outside the International Space Station on Tuesday for a seven-hour, 24-minute spacewalk to repair the orbiting outpost's aging robotic arm, NASA said.

During what NASA commentator Rob Navias described as a "textbook" spacewalk, NASA flight engineers Mark Vande Hei and Scott Tingle replaced a faulty latching end on the 57-foot (17-meter) Canadian-made robotic arm, called Canadarm2.

The arm is used to grasp incoming cargo ships and to move items around outside the space lab.

The station's robotic arm "has experienced some degradation of its snaring cables," NASA said in a statement.

The arm has been a key piece of equipment at the orbiting outpost for 17 years, but in August it lost its ability to grip effectively.

In October 2017, NASA astronauts completed three spacewalks to repair the robotic arm and replace cameras necessary to get a good view of the approaching cargo ships.

Tuesday's outing was the first career spacewalk for Tingle, and the third for Vande Hei. It was the 206th in support of space station assembly and maintenance.

Another spacewalk is planned for January 29, including Vande Hei and flight engineer Norishige Kanai of the Japan Aerospace Exploration Agency (JAXA), to make more repairs outside the space station.

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Columbus: 10 years a lab
Paris (ESA) Jan 18, 2018
In 1492 Columbus sailed the ocean blue... In 2008 another Columbus sailed into space. Next month, Europe's Columbus laboratory achieves 10 years in orbit. Circling our planet at 28 800 km/h, this element of the International Space Station created space history as the first European module dedicated to long-term research in weightlessness. Throughout this year, we will be celebrating ... read more

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