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Morning. it will be 6 1/2 hours long. what do you think the degree of difficulty will be for the spacewalkers? >> last week santa ana a -- last week he was asked for a degree of challenge. he says it's something they trained for in the past. he feels confident. mission control in houston will follow it all including monitoring the helmet issue. multiple science experiments have been shut down so as not create more heat. it also canceled the orbital launch which was scheduled for tomorrow night. it's been pushed back to january. so three important serious space

Overheat or cool too much. >> the space walk was not the first option. the attempt was to repair it remotely and that did not work. in your description of it being a simple repair. if it can't be done remotely, why are they at this point with the space walk? >> they are at the point with the space walk -- this is the thing that separates it from being simple to complex. space walks are risky. they have to do the repair outside because the pump module that holds the valve is on the exterior of the space station on the main truss. they have to go outside, remove all of the connections that carry...

But have had to shut down some nonessential systems. they just don't have enough cooling capacity with the two pumps, with one not working at 100%. they don't have enough capacity to keep everything cold. but the life support system is fine. science experiments are fine. there's no problem there. we're just really waiting on the mission management team and the troubleshooting to be done to figure out if, indeed, they'll have to -- they can fix it another way or if they have to actually go outside and do the work. carol? >> cnn's john zarrella reporting live from miami. thanks. facebook may h...

Best to the whole family. >> thank you very much. wolf. all right. some breaking news coming into "the situation room." we're just learning about a serious situation on the international space station. joining us on the phone is cnn's john zarrella. what are we learning, john? >> reporter: what we know is one of the two pumps on the station that actually cools the international station has failed. most importantly, there is no danger to the crew, the life-support system is working fine. science experiments are working fine, but they've had to transfer a lot of the load over to the second pum...

100 murders and at least ten kidnappings since it was formed in the early 1980s. >> no arrests have been made in either murder case right now. officials aren't saying what the security issue was that caused the prosecutor to quit. we understand now that u.s. attorney from washington, d.c. will take over that case. we've been talking a lot about the aryan brotherhood, but that's the only theory underway here. they're also looking at drug cartels or maybe somebody with a grudge who could have been responsible for these killings. we just don't know yet. >> gretchen: all right. scary times. thank ...