Russell Henry Norris
Russell
, Henry Norris 1877-1957. American astronomer who developed a theory of stellar evolution and devised the Hertzsprung-Russell diagram.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.