The critical robot arm on the ISS isn't working properly, but NASA has a plan to fix it

A multi-segmented arm extends from a cylindrical space station module. the blue-and-white curvature of earth is visible below.

One of the space station's robot arms, crucial for catching cargo ships and doing a share of maintenance duties, is offline for at least a few weeks for repairs.

Canadarm2, which just passed 25 years of service in April on the International Space Station (ISS), will require a spacewalk to fix an apparently broken part that seized up during routine work on May 27, NASA said in a blog post Wednesday (June 10).