| 1. | Block II spacecraft were 3-axis stabilized, with ground pointing using reaction wheels.
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| 2. | To control satellite orientation, several magnetorquer coils and reaction wheels were added.
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| 3. | The problem had cropped up in one of the craft's reaction wheels.
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| 4. | Attitude control was achieved using the hydrazine thrusters and four reaction wheels.
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| 5. | Designers therefore supplement reaction wheel systems with other attitude control mechanisms.
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| 6. | It is 3-axis body stabilised using Sun and Earth sensors, momentum and reaction wheels.
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| 7. | The reaction wheels slowly move the 25, 000-pound telescope from one point to another.
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| 8. | The reaction wheels can only provide a certain amount of change in angular momentum.
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| 9. | Over time, reaction wheels may build up stored momentum that needs to be cancelled.
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| 10. | One of Hubble's four reaction wheels briefly malfunctioned in November.
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