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$\begingroup$ Worth noting that mechanical spinning gyroscopes are not mandatory, it's a systems design choice with the technology of the era. JWST uses hemispherical resonator gyroscopes that merely vibrate, the lower precision is made up by much more advanced star tracking. Another option is fiber-optic gyros which eliminate moving parts, but are subject to radiation damage. $\endgroup$
– user71659
Commented Jun 19 at 18:37

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