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Valve that's in this big pump module. in toward get the two loops back up again, they were flying with one loop but if you lose the last one you are out of luck cooling wise. so they want to bring that second loop back up and tried lots of creative things and the only solution they were left with was to go out and do these space walks to change out the pump module and that's going pretty well. they almost are done. they will to be done in a couple more hours and have another loop up and working sponsorship it's very important but looks like it's going pretty well for them so far. >> clearly th...

Now they're moving it to get it in position, and once they get it anchored where it's supposed to be and they flip on the pump, if it all works they'll be through with the job. everything will be back up to normal. >> so, jay, that's on the left-hand side there. right? that's the new pump we're seeing on the left-hand side that they're putting in? >> that is absolutely correct. they added on another truss. they're moving it over there in position right now. they're running a little bit behind, but everything's going real well and they hope to wrap up the whole job today, richard. >> now, jay, ...

Got a very difficult situation. these astronauts have been working diligently for more than five hours. we've been monitoring this feed and we've heard mention of some ammonia flakes potentially touching some of the space suits. the significance of that however, we don't noech. as you just heard it seems like they are continuing the process of attaching this spare pump to the international space station. and the hope in all of this has been they'll be able to successfully do that just in time for christmas. >> a few minutes ahead of schedule, nasa started another space walk to support the orbi...

Ammonia flakes floating out as they were attaching the fluid lines and that would decontaminate space suits for the next one on the agenda. >> i guess later tonight we will know for sure whether the cooling system actually has been repaired. >> yeah. that will basically justify the preliminary approval of the bump test. the pressurization will happen around 9:00 eastern time tonight. both are back up and running in unison. the science research that has been on hold for the past two weeks and finally resumes. this christmas eve space walk did have its befestive moment. >> best christmas ever. t...

But nasa pushed it back for a days because of the one of the problems with the astronaut's space suits. >> did you see the video over the weekend? >> incredible. >> whether you're a space nut or what. >> just a nerd. >> i am too. it's all good. >> it's amazing to watch. >> it is. coming up here on "early start," anticipation growing at the vatican as pope francis gets ready to celebrate his first christmas as leader of the roman catholic church. we are live with that story. we are hearing the terrifying moments at a hospital campus when a gunman stormed in and opened fire. that story after...