NASA Made This Dramatic Decision To Fight For The Hubble Space Telescope's Survival
Briefly

Hubble's observation capability is dropping 12 to 25 percent as it transitions to using only one of its gyros, with a second on standby, affecting its efficiency.
Gyro three continues to encounter problems, leading to the decision to retire it, reducing Hubble's abilities to track closer objects and limiting available sky for observations.
Read at Inverse
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