Spacewalking astronauts work on ISS plumbing

NASA astronauts took a spacewalk on Saturday to rearrange space station plumbing, careful to avoid toxic ammonia coolant still lingering in the lines.

The work should have been completed during a trip outside the International Space Station a week ago, but power upgrades took longer than expected.

Eager to get the station improvements done before the astronauts head home this spring, Mission Control ordered up the bonus spacewalk for Victor Glover and Mike Hopkins.

The two needed to vent a couple of ammonia jumper lines that are part of the external cooling system.