gold-plated mirrors will align to create one giant mirror. it s 21 feet across, six times larger than the one on the hubble space telescope. for more than three decades, hubble has given us stunning, humbling views of the universe. but, webb will be a major upgrade. like a night vision camera, this infrared telescope will search for heat signatures of the very first light after the big bang. we are looking for the of the faintest objects, if the telescope doesn t get cold then it will actually glow brighter than the objects we re looking for. reporter: to block the sun s heat from blinding webb, engineers designed a first of its kind sun shield, the size of a tennis court. its five layers will keep the telescope side more than 600 degrees colder than the sun- facing side. this material, kaptan, here is about 2 thousandths of an inch thick. reporter: and because the sun
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