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I noticed that the TLEs for the Hubble Space Telescope (HST) are posted almost twice a day. Then I looked back in time and saw that this rate varies quite a lot! …

Hubble was designed to accommodate regular servicing and equipment upgrades while in orbit. Instruments and limited life items were designed as orbital replacement units. … Question: Is the Hubble Space Telescope on its last legs, or "back to normal"? …

The article in Forbes Former Astronauts Share Ways To Cope With Social Distancing & Isolation includes the following image of the Hubble Space Telescope. … Astronaut John Grunsfeld performs work while participating in the first of five scheduled spacewalks while servicing the Hubble Space Telescope. GETTY IMAGES & NASA …

NASA announced in June 2012 that it had acquired the instruments, which are designed to have a much wider field of view than Hubble, despite sporting Hubble-like 8-foot-wide (2.4 meters) main mirrors. … It's possible that sources might be available from Was Hubble really related to spy satellites? How much larger are we talking about here; 50%? a factor of ten? …

above: "The Hubble Space Telescope as seen from the departing Space Shuttle Atlantis, flying STS-125, HST Servicing Mission 4." Cropped, from here. … From here above: "IMAX Cargo Bay Camera view of the Hubble Space Telescope at the moment of release, mission STS-31." Cropped, from here. …

I like that there was a plan in place to run Hubble in one-gyro mode when the point in time arrives that Hubble had only two left. But I don't understand how that's possible. … How does it work exactly to keep Hubble pointed during measurements, then rapidly slew to the next target? …

Hubble wouldn't have to change focus for Pranksat to work because Pranksat is cleverly designed to present a virtual image with a focus at infinity. … Question: Has Hubble ever focused on something close enough that it had to move away from being focused at infinity? …

in Astronomy SE quotes Assessment of Options for Extending the Life of the Hubble Space Telescope: Final Report as follows: Hubble was designed with an anticipated 15-year lifetime based on the expected …

that NASA in designing the Hubble Telescope not only limited the jerk in their requirement specification, but also the next higher derivative, the jounce. …

Even Hubble benefitted from several swap-outs of equipment. The JWST - What happens if/when it breaks? It stays broke! Is it possible to refuel the James Webb Space Telescope? No it is not! …

Question: Can someone identify this photograph of the Hubble Space Telescope seen as a still in the Los Angeles Times YouTube video Scientists witness huge cosmic crash, find origins of gold, figure …

Table 3. in paper Hubble Space Telescope Reduced-Gyro Control Law Design, Implementation and On-Orbit Performance; AAS 08-278 found in @OrganicMarble's answer seems to give the unit vectors where the HST's … Question: How were the orientations of the Hubble Space Telescope's Star cameras, rate gyros and reaction wheels (3+6+4=13) optimized to work together in a coordinated way? …

Background Hubble has had at least a few troubling issues that were resolved from the ground in recent years, a summary can be found in Engadget's NASA struggles to fix a Hubble Space Telescope computer … With an external airlock attached, could Commercial Crew Program spacecraft service Hubble? …