Timeline for Why don't they put more spare gyroscopes in expensive space telescopes?
Current License: CC BY-SA 4.0
17 events
| when toggle format | what | by | license | comment | |
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| S Jun 20 at 22:09 | history | suggested | William Herschel of Ostropol | CC BY-SA 4.0 |
no Greek cuisine in title
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| Jun 20 at 21:57 | comment | added | Miss Understands | If the gyros ALWAYS fail first, you always add a gyro. Obviously. If that reduces fuel, it's just an optimization problem. God! | |
| Jun 20 at 17:23 | review | Suggested edits | |||
| S Jun 20 at 22:09 | |||||
| Jun 20 at 16:57 | comment | added | Bob Goddard | You load the vehicle with 5 gyros and 1 unit of fuel. The fuel runs and for the next mission you put 2 units on board. This next mission eventually all the gyros fail and for the next one, you put 8. But this next mission all the fuel runs out, so next time, you put 3 units on board, and so the loop continues. At what point do you say enough is enough? | |
| Jun 20 at 14:09 | comment | added | Darth Pseudonym | Hubble had six gyros and got them all replaced during one of the service missions. That's 12 gyros. How many more do you think it needed? | |
| Jun 19 at 23:52 | vote | accept | Miss Understands | ||
| S Jun 19 at 23:49 | vote | accept | Miss Understands | ||
| Jun 19 at 23:52 | |||||
| Jun 19 at 23:15 | comment | added | Xavier | It is worth mentioning that gyro and reaction wheel failures could have been due to coronal mass ejections (CMEs) from the Sun causing arcing between the metal bearings and races. Space missions have changed from metal ball bearings to ceramic bearings in their reaction wheels, greatly reducing the chance of arcing across the bearing races. hackaday.com/2018/09/11/… | |
| Jun 19 at 13:20 | vote | accept | Miss Understands | ||
| S Jun 19 at 23:49 | |||||
| Jun 19 at 13:07 | answer | added | GremlinWranger | timeline score: 12 | |
| Jun 19 at 9:34 | comment | added | uhoh | Also see answers to Which (if any) space telescope would have worked longer if it hadn't simply run out of helium? | |
| Jun 19 at 9:34 | comment | added | uhoh | "I could be forgetting some ..." Here's some: On 29 April 2013, ESA announced that Herschel's supply of liquid helium, used to cool the instruments and detectors on board, had been depleted, thus ending its mission. and Infrared Space Observatory; End of mission and Spitzer Warm mission and end of mission | |
| Jun 19 at 9:25 | history | became hot network question | |||
| Jun 19 at 2:01 | answer | added | HDE 226868♦ | timeline score: 53 | |
| Jun 19 at 1:53 | answer | added | John Doty | timeline score: 12 | |
| Jun 19 at 1:34 | history | edited | Miss Understands | CC BY-SA 4.0 |
edited body
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| Jun 19 at 1:22 | history | asked | Miss Understands | CC BY-SA 4.0 |