Can satellites see underground?

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Tags

1. #affected
2. #could
3. #unsure
4. #satellites
5. #ground
6. #scientists
7. #researchers
8. #detect
9. #there
10. #features
11. #microwave
12. #underground
13. #below
14. #surface
15. #objects
16. #suspected
17. #radar
18. #sensing