Repairs made at space station

Astronauts making a rare, hastily planned space walk replaced a pump outside the International Space Station on Saturday in hopes of plugging a serious ammonia leak. The prospects of success grew as the minutes, then hours, passed and no frozen flecks of ammonia appeared. Mission Control said it appeared the leak may have been plugged, although additional monitoring over the coming weeks will be needed before declaring a victory. More

(Source: Philly.com - May 13)