https://apnews.com/16d6351c540714cf90bcb78e378901c7 > CAPE CANAVERAL, Fla. (AP) — A pair of NASA astronauts floated out on a spacewalk Saturday to rearrange space station plumbing, careful to avoid toxic ammonia coolant still lingering in the lines. > The hose work should have been completed during a spacewalk outside the International Space Station a week ago, but was put off when power upgrades took longer than expected.