When was Ultima Thule discovered?

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Tags

  1. #formation
  2. #rotating
  3. #originally
  4. #years
  5. #thule
  6. #thought
  7. #cloud
  8. #system
  9. #objects
  10. #formed
  11. #since
  12. #small
  13. #nicknamed
  14. #ultima
  15. #solar
  16. #billion
  17. #bodies