As In June Of 2021, Hubble's Third Gyroscope Is Rendering Inconsistent Readings -- Hubble May Go To A One Gyro- Slew Configuration...

This 'scope has been in service since 1990 -- and last had six gyros installed in 2009, by the then space shuttle "capture / repair" missions. So it has had a wonderful ride. . . but is, indeed a very old spacecraft.

With the next-gen space scope (JWST) operating flawlessly, and providing far sharper imagery. . . it may be, that in due course, this one is allowed to safely deorbit. But for now, science will continue (once the fix is applied, ground-side) -- even if need be, on one gyroscope. Here's the latest:

. . .The telescope automatically entered safe mode when one of its three gyroscopes gave faulty readings. The gyros measure the telescope’s turn rates and are part of the system that determines which direction the telescope is pointed. While in safe mode, science operations are suspended, and the telescope waits for new directions from the ground.

This particular gyro caused Hubble to enter safe mode in November after returning similar faulty readings. The team is currently working to identify potential solutions. If necessary, the spacecraft can be re-configured to operate with only one gyro, with the other remaining gyro placed in reserve. The spacecraft had six new gyros installed during the fifth and final space shuttle servicing mission in 2009. To date, three of those gyros remain operational, including the gyro currently experiencing fluctuations. Hubble uses three gyros to maximize efficiency, but could continue to make science observations with only one gyro if required. . . .

Now you know. . . onward, grinning, with a legacy graphic -- and baby girls due here this evening.

नमस्ते