February 18, 1957 (, 19 Ding first month), the American astronomer, modern astrophysics, one of the founders of Russell's death. the


Russell
Russell (1877-1957), February 18, 1957 (�Ө�d��y����h�� $ �Ө�ry.c��m) American astronomer, modern astrophysics and stellar astronomy, one of the founders of Russell, died at the age of 80. He developed a stellar brightness and spectral type diagram and calculated binary method, had a profound influence on the development of 20th century astronomy. 1929 Russell prove the content of hydrogen in the sun after a careful study of the solar spectrum, amazing. He concluded that the hydrogen accounted for three-fifths of the total solar volume. Respective independent the Danish astronomer He Zipu Dragon by stellar spectra study found that the relationship of the star's luminosity and surface temperature, known as the "HR diagram". (History. Cn)