lillian russell

Science Dictionary
Russell   (rŭs'əl)  Pronunciation Key 
American astronomer who studied binary stars and developed methods to calculate their mass and distances. Working independently of Ejnar Hertzsprung, Russell also demonstrated the relationship between types of stars and their absolute magnitude. This correlation is now known as the Hertzsprung-Russell diagram.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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