What is a cluster in space?

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Tags

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2. #fewer
3. #tight
4. #members
5. #hundreds
6. #types
7. #globular
8. #contain
9. #groups
10. #clustered
11. #distinguished
12. #generally
13. #hundred
14. #millions
15. #clusters
16. #gravitationally
17. #young
18. #while
19. #bound
20. #stars
21. #loosely
22. #which