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This is really, really difficult engineering. but, you know, nasa has never shied away from doing hard things and so i have full confidence that it's going to work. unfurling the sun shield is the most difficult part of this process. it's enormous — the size of a tennis court. first, its two halves are lowered into position. then, the booms are deployed. the operation involves 400 pulleys, 400 metres of cabling and more than 100 release mechanisms that have to fire at exactly the right time. finally, the material is pulled taut, and the five layers of the sun shield, each as thin as a human ...

With a million mile journey ahead. but, as it travels, it has a fiendishly difficult task to do — unfolding. it's so big, we didn't have any rocket that's big enough to launch it, you know, fully deployed. so, we had to build this telescope to be folded up, to fit inside the rocket. this is really, really difficult engineering. but, you know, nasa has never shied away from doing hard things. and so i have full confidence that it's going to work. unfurling the sun shield is the most difficult part of this process. it's enormous, the size of a tennis court. first, its two halves are lowered in...

And so i have full confidence that it's going to work. unfurling the sun shield is the most difficult part of this process. it's enormous, the size of a tennis court. first, its two halves are lowered into position. then the booms are deployed. the operation involves 400 pulleys, 400 metres of cabling and more than 100 release mechanisms that have to fire at exactly the right time. finally, the material is pulled taut, and the five layers of the sun shield, each as thin as a human hair, separate. the whole process has been rehearsed again and again on earth. but doing this in space will be nai...

A fiendishly difficult task to do — unfolding. it's so big, we didn't have any rocket that's big enough to launch it, you know, fully deployed. so, we had to build this telescope to be folded up, to fit inside the rocket. this is really, really difficult engineering. but, you know, nasa has never shied away from doing hard things. and so i have full confidence that it's going to work. unfurling the sun shield is the most difficult part of this process. it's enormous, the size of a tennis court. first, its two halves are lowered into position. then the booms are deployed. the operation involv...

Is pulled taut, and the five layers of the sun shield, each as thin as a human hair, separate. the whole process has been rehearsed again and again on earth. but doing this in space will be nail—biting. it's made of floppy material, it has to be held on to by a series of pins, which release one by one, pull it out, make it tight, release another bit, pull it out again. until slowly, over days, you pull out this tennis court sized object. so, for many people working on the project, that's where the real nerves are. the sun shield protects the telescope from the heat and light of the sun. the ...