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From martian moons to double stars, this historic telescope made its mark on the field.

United statesFoggy bottomDistrict of columbiaUnited kingdomGeorgetown heightsUnited states naval observatoryLick observatoryHarry burtonEugene casserlyHannibal hamlinFriedrich georg wilhelmAlvan clarkStimson brownJoseph fraunhoferBevan sharplessBenjamin sands