Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun astronomy : a
plot of theabsolute magnitude ofstars versus theircolour (orsurface temperature ); shows themain sequence of stars plus thewhite dwarfs andred giants
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
From Ejnar Hertzsprung and Henry Norris Russell, astronomers
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