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low weight. Although in the essentially weightless environment of space the mirror will weigh hardly anything, it needs to be very stiff to maintain its shape. The Wavefront sensing and control sub-system is designed to make the 18 segment primary mirror behave as a monolithic (single-piece) mirror, and it does this in part by actively sensing and correcting for errors. There are nine distance alignment processes that the telescope goes through to achieve this. Another important aspect to the adjustments is that the primary mirror backplane assembly

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