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Mauna Kea Telescopes
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Webb Telescope's Mirror Size and Material | Webb
File:Four types of mirrors on the Webb telescope.jpg - Wikimedia Commons
Cassegrain Formulas and Tips by Mike Lockwood
the moon - Were the Apollo lunar activities observed from Earth? - Space Exploration Stack Exchange
File:Comparison optical telescope primary mirrors.svg - Wikipedia
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Inside NASA's new golden mirror space telescope
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