Is Landsat passive or active?

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Tags

1. #sensors
2. #light
3. #satellites
4. #passive
5. #thermal
6. #imaging
7. #radiation
8. #since
9. #surface
10. #their
11. #earth
12. #receive
13. #landsat
14. #space
15. #natural
16. #collected
17. #about
18. #scanner
19. #information