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It s been busy unfurling, first its sun shield, which is the size of a tennis court. but now a vital stage of the process is beginning. the mirror is the most important part of the telescope. its two folded sides open up and lock into place at 6.5 metres wide. it s so big that it consists of 18 separate hexagonal segments. they re made from beryllium, a stiff and lightweight metal that can withstand the extreme temperatures of space. the whole thing is covered in gold so thin that the entire coating coating weighsjust 50g, the weight of a golf ball. although it s made of segments, each one has to line up perfectly for it to act as a single huge mirror. each one of those mirrors, which is very lightweight, they have motors on the back which can move them up and down, tip them sideways, rotate them and even slightly bend them to make sure that they have exactly the right focus. the telescope will be hunting for the most distant stars and galaxies. but to do this, it doesn t ....