On Oct. 5, Hubble was pushed into safe mode after one of its gyroscopes stopped working. The gyroscopes allow Hubble to turn and lock on to new targets to observe.
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NASA was able to get a backup gyroscope on the telescope running after it initially was returning very high rotation rates. Safeguards have been put in place in case it returns to those higher rates, but it's not likely, said the agency.
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Over the last several days, engineers performed a series of maneuvers and collected data to make sure the telescope could properly rotate in the sky and pinpoint targets.
Hubble launched in April 1990, becoming the first major optical telescope placed in space. Over the past 28 years, Hubble has streamed back key data on subjects such as dark matter and how planets form.
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