Did Mars ever have a magnetic field?

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6. Why is ozone important?
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Tags

1. #retaining
2. #global
3. #challenges
4. #magnetic
5. #mitigating
6. #intrinsic
7. #leading
8. #tubes
9. #directly
10. #radiation
11. #solar
12. #interacts
13. #field
14. #poses
15. #formation
16. #atmosphere
17. #magnetosphere