What cloud extending to the gravitational limits of the solar system would comets come from?

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Tags

1. #affected
2. #extent
3. #boundary
4. #solar
5. #bound
6. #itself
7. #gravitational
8. #outer
9. #defines
10. #sphere
11. #cloud
12. #stars
13. #loosely
14. #passing
15. #milky
16. #easily
17. #limit
18. #cosmographical
19. #system