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How big are the Gemini domes?

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How big are the Gemini domes?

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Each of the Gemini Observatory domes is over 15 stories (45 m) high and weighs more than 600 tonnes. When a Gemini telescope is in use, 10-m wide vents open at the base of its dome to regulate the air temperature above the mirror. This lets the telescope make sharper images.

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