Astronauts take a spacewalk to lubricate robotic arm

Washington : Two astronauts aboard the International Space Station (ISS) have completed a spacewalk lasting about 6.5 hours to lubricate components of the new latching end effector they installed in the previous spacewalk on the Canadarm2 robotic arm.

Expedition 53 Commander Randy Bresnik and Flight Engineer Mark Vande Hei of NASA also replaced a faulty camera system during the spacewalk on Tuesday.

The astronauts also completed a variety of additional tasks, including replacing a smudged lens cover and removing two handrails from outside the tranquillity module in preparation for a future wireless antenna installation, NASA scientists wrote in a blog post.