Friday's failure means Hubble is down to just two, a situation that triggered its entry into safe mode.
"The gyro that failed had been exhibiting end-of-life behavior for approximately a year, and its failure was not unexpected; two other gyros of the same type had already failed".
On Monday, NASA tweeted: "The Hubble team is working to resume science after Hubble entered safe mode due to 1 of 3 gyros failing". Upon powering on the third enhanced gyro that had been held in reserve, analysis of spacecraft telemetry indicated that it was not performing at the level required for operations.
Hubble has carried a total of six gyroscopes - three standard and three enhanced - since astronauts installed them during a spacewalk in 2009, typically using three at once.
The telescope needs three working gyroscopes to 'ensure optimal efficiency'.
The telescope, which travels the Earth at about five miles per second - equivalent to driving from America's East to West Coast in just 10 minutes - faces out to space to take pictures of planets, stars and galaxies to help scientists learn about the solar system.
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"There isn't much difference between 2- [gyros] and 1, and it buys lots of extra observing time", tweeted Rachel Osten, the deputy mission head for Hubble at the Space Telescope Science Institute, late October 7.
Osten said, 'The plan has always been to drop to 1-gyro mode when two remain.
Though three gyroscopes are ideal, the telescope can be used on only one. That extended lifetime is something the astronomical community "wants desperately", she added.
"While reduced-gyro mode offers less sky coverage at any particular time, there is relatively limited impact on the overall scientific capabilities". The current problem, though, is a reminder that, with the retirement of the shuttle, NASA now lacks a means to fix or upgrade Hubble.
Science operations with Hubble have been suspended while NASA investigates the anomaly.
Launched into deep space in 1990, the large, long orbit telescope is packed with instruments like cameras, spectrographs and interferometers to clear up mysteries of the universe.