Why is the Pistol Star Blue?

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Tags

1. #pistol
2. #galactic
3. #region
4. #hypergiant
5. #center
6. #which
7. #stars
8. #young
9. #massive
10. #nebula
11. #illuminates
12. #known
13. #quintuplet
14. #shape
15. #milky
16. #luminous
17. #cluster