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• Dutch astronomer who proved that the galaxy is rotating and proposed the existence of the Oort cloud (1900-1992)

Dutch astronomer who proved that the galaxy is rotating and proposed the existence of the Oort cloud (1900-1992), 4 letters, 1st letter O
Dutch astronomer who proved that the galaxy is rotating and proposed the existence of the Oort cloud (1900-1992), 4 letters, 2nd letter O
Dutch astronomer who proved that the galaxy is rotating and proposed the existence of the Oort cloud (1900-1992), 4 letters, 3rd letter R
Dutch astronomer who proved that the galaxy is rotating and proposed the existence of the Oort cloud (1900-1992), 4 letters, 4th letter T

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