The Christmas Eve spacewalk planned by NASA at the International Space Station should wrap up repair work on a faulty cooling line.
Mission Control said Monday that unless something goes awry, two astronauts ought to finish installing a new ammonia pump Tuesday, during this second spacewalk. NASA originally thought three spacewalks might be needed.
Astronauts Rick Mastracchio and Michael Hopkins removed the faulty pump Saturday. Everything went so well, they jumped ahead in their effort to fix the external cooling line that shut down Dec. 11