What causes atmospheric blurring?

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Tags

1. #turbulent
2. #apparent
3. #index
4. #refractive
5. #refers
6. #blurring
7. #seeing
8. #atmosphere
9. #optical
10. #astronomical
11. #objects
12. #twinkling
13. #mixing
14. #stars
15. #causing
16. #variations
17. #earth
18. #amount