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Shield is so big, it and everything else had to fold up to fit inside the rocket. once in space, webb will carefully unfold and rebuild itself like robotic origami. project manager bill oaks. >> it is hands down the complexity of its deployment, the material it's been made of, has never been tried by a nasa mission before. >> reporter: if any one of 344 parts fail, the entire mission could be jeopardized. about one-third involve deploying of that sun shield. 1,300 feet of cables almost 600 pulley assemblies. and it all has to work. a million miles out, no calling a.a.a. >> no, but i'm confiden...

Until the telescope is off the top of the rocket over africa, and we will get a signal through kenya and then we will know it's on its way. that is not the end of it, however. they have to get out observing station about one million kilometres from earth and when it does that, it has to unfold itself. and this is a bit of a nightmare but when you see the complexity that is involved. engineers talk about single—point failures. these are activities, events which have happen on cue and in the right order and if one of them fails, the whole thing is over. webb has 344 potential single—point fa...

Cold, it will actually glow brighter than the objoro blo th, engineers designed a first of its kind sun shield, the size of a tennis court. it's five layers will keep the telescope side more than 600 degrees colder than the sun facing side. >> this material here is about 2 thousandths of an inch thick. >> reporter: once in space, webb will carefully unfold and rebuild itself like robotic origami. project manager bill oaks. >> the complexity, the deployment, the materials has never been tried by a n.a.s.a. mission before. >> reporter: if any one of 344 parts fail, the entire mission could be je...

Time, and, a high risk operation. there are 344 things that could go wrong if any one of them on this telescope, but we're very confident. >> the star played a role on christmas day, as i remember. if you ever need someone to join folks on one of those trips up there, just, you know, call me up. i'm always game. >> we're taking applicants for nasa astronauts. >> all right, i'll be filling mine in during the break. bill nelson, thank you for coming on. we wish you a very merry christmas. >> thank you, jim. as you know, jury has found a former police officer guilty of manslaughter. two counts ...

Single point failures that could keep webb from the imperfectly deployed and that makes every single one of those 3aa steps critically important. mr; one of those 3aa steps critically im ortant. , , one of those 344 steps critically important-— important. my little boy will be lookin: to important. my little boy will be looking to the _ important. my little boy will be looking to the sky _ important. my little boy will be looking to the sky on _ important. my little boy will be| looking to the sky on christmas important. my little boy will be - looking to the sky on christmas eve but i that ...