Tudalennau sy'n cysylltu â "Delwedd:Utrecht astronomy symposium 1963 - Jan Hendrik Oort, Donald Menzel, Charlotte Moore Sitterly, Marcel Minnaert, Albrecht Unsöld (cropped) - Charlotte Moore Sitterly.jpg"

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Mae'r tudalennau isod yn cysylltu â Delwedd:Utrecht astronomy symposium 1963 - Jan Hendrik Oort, Donald Menzel, Charlotte Moore Sitterly, Marcel Minnaert, Albrecht Unsöld (cropped) - Charlotte Moore Sitterly.jpg:

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