What does the black thing symbolize in a wrinkle in time?

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Tags

1. #certain
2. #wallace
3. #calvin
4. #control
5. #rescue
6. #thing
7. #planets
8. #under
9. #shadow
10. #black
11. #force
12. #planet
13. #order
14. #which
15. #murray
16. #lesson
17. #surrounding
18. #imprisonment
19. #universe
20. #camazotz
21. #fight
22. #summary
23. #appears
24. #charles