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How We Recoat the LDT’s 14-foot Primary Mirror

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The massive primary mirror of the Lowell Discovery Telescope (LDT) measures 14 feet in diameter by 4 inches thick. Yet its critical reflective layer is only 100 nanometers thick—1,000 times thinner than typical photocopy paper! This aluminum skin must be periodically replaced, a painstaking process that takes weeks to complete. Tonight, LDT Engineering Manager Frank […]

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