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NASA confirms that #Hubble will switch to one-gyroscope mode after the increasingly erratic behavior of gyro 3 caused the observatory to repeatedly go into safe mode.

Hubble will continue doing great science, but with somewhat reduced efficiency. It will need more time to slew and lock onto science targets. There is also a limit to the fraction of the sky it can observe at any one time (although it will have access to the full sky over the course of a year).

More: https://science.nasa.gov/missions/hubble/nasa-to-change-how-it-points-hubble-space-telescope/

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