Why is the HR diagram important?

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Tags

1. #color
2. #temperature
3. #diagram
4. #classify
5. #russell
6. #stage
7. #their
8. #stars
9. #stable
10. #along
11. #burning
12. #graphical
13. #evolutionary
14. #spectral
15. #hydrogen
16. #phase
17. #according
18. #sequence
19. #hertzsprung
20. #luminosity
21. #astronomers