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??????? ????? ???????? ( ?????? : Heber Doust Curtis ; 27 ???????? ?.?. 1872 - 9 ?????? ?.?. 1942 ) ???? ????????????? ??? ???????? ???????????????????????????? (Allegheny Observatory) ?????????????????????????????????????????????? " The Great Debate " ??? ???????? ??????? ???? ?.?. 1920 ???????????????? ??????? ??? ???????? ?????????? ?????

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