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by dr_orpheus 728 days ago
No, these are actually referring to the gyroscopic sensors on the spacecraft. This article [0] makes it a little bit more clear. While there are actuators that use gyroscopic torque, referred to as Control Moment Gyros (CMG) Hubble uses reaction wheels for pointing the spacecraft.

[0] https://science.nasa.gov/mission/hubble/observatory/design/h...