| 11. | Before hibernation, two of the spacecraft's four reaction wheels began exhibiting " noise ".
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| 12. | For this reason, reaction wheels are often used to aim spacecraft carrying cameras or telescopes.
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| 13. | Reaction wheels resist changes in orientation due to torque.
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| 14. | The orbit was sun-synchronous, and the attitude of the spacecraft could be controlled through reaction wheels.
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| 15. | In 2004, during the mission of the " Hayabusa " spacecraft, an X-axis reaction wheel failed.
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| 16. | The ROSAT reaction wheels lasted over 8 years.
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| 17. | Ground controllers grew concerned when one of the reaction wheels turned sluggishly in response to their commands.
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| 18. | Attitude is adjusted through three reaction wheels.
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| 19. | However, it also has a set of actual spinning reaction wheels to turn the telescope without using propellant.
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| 20. | On July 14, 2012, one of the four reaction wheels used for fine pointing of the spacecraft failed.
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