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Mount Wilson Observatory in Pasadena is home to some of the world's oldest telescopes that have been able to provide revolutionary discoveries about the world.

San diegoUnited statesMount wilsonMount wilson observatoryEdwardc pickeringGeorge ellery haleGeorgew ritcheyCarnegie institution of washingtonMassachusetts institute of technologyHarvard college observatoryMassachusetts instituteHarvard collegeCarnegie institution