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What is so unique about the mirrors of very large telescopes such as the Keck Observatory and the GTA telescope on the Canary Islands.? Group

What is so unique about the mirrors of very large telescopes such as the Keck Observatory and the GTA telescope on the Canary Islands.? Group of answer choices The mirrors are made of a newly designed metallic material. The mirrors can fold up when not in use. The mirrors are inexpensive. The mirrors are segmented. The mirrors are thin

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