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| | [No title] (Site not responding. Last check: 2007-11-03) |
 | | HST is a very sophisticated satellite with many complex systems, including systems for power, pointing control, health and safety, communications, and of course the science instruments themselves. |
 | | There are thousands of sensors on-board HST to report temperatures, voltages, power levels, etc. so that the operations support staff can monitor in detail the health and safety of HST 24 hours a day. |
 | | HST has several redundant systems, including the gyroscopes that are used to maintain its precise pointing. |
| quest.arc.nasa.gov /hst/QA/HST_Backup_Power/HST_equipment_failures.1 (565 words) |
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