How did Thanos get the first stone?

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Tags

1. #infinity
2. #space
3. #found
4. #asgard
5. #stone
6. #second
7. #xander
8. #guardians
9. #family
10. #thanos
11. #power
12. #collected
13. #already
14. #which
15. #after
16. #destroying
17. #mentions
18. #tesseract
19. #possess
20. #originally