NASA's Hubble Telescope experiences mechanical failure

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NASA's Hubble Space Telescope has gone into safe mode after two of its four functioning gyroscopes stopped working.

The Hubble had been operating with four of its six gyroscopes when two of them failed, according to reports from NASA.

At any given time, the Hubble needs at least three of its gyroscopes to work for optimal efficiency.

After one of the gyroscopes failed, controllers tried to switch to another newer gyroscope, however, that one failed as well, leaving the Hubble with only two fully functioning gyroscopes.

Gyroscopes are mainly used to steer the Hubble and makes sure the telescope is steady in space.

The failure was "not unexpected" as two other gyros of the same model had already experienced problems, according to a NASA statement.

NASA also tweeted it was conducting tests on the newer gyroscope to determine the problems.

If it is not successful, the Hubble will operate in a "reduced-gyro" mode, using only one gyro in order to let the telescope operate for a longer time.

However, this would affect the Hubble's ability to track fast moving objects as well as reduce the amount of sky it can view in any given moment, according to NASA.

RUNDOWN SHOWS:
1. The Hubble Space Telescope and its gyroscope system is shown.
2. Gyroscopes installed in the telescope.
3. The newer gyroscope is shown.
4. The gyroscope is shown steadying the telescope.

VOICEOVER (in English):
"NASA's Hubble Space Telescope has gone into safe mode after two of its four functioning gyroscopes stopped working."

"According to reports from NASA, the Hubble had been operating with four of its six gyroscopes when two of them failed."

"After one of them failed, controllers tried to switch to another newer gyroscope, however, that one failed as well, leaving the Hubble with only two fully functioning gyroscopes."

"Gyroscopes are mainly used to steer the Hubble and makes sure the telescope is steady in space."

SOURCES: BBC News, The Verge, CBS News, Space.com, CNN, NASA
https://www.bbc.com/news/science-environment-45788412
https://www.theverge.com/2018/10/8/17951512/nasa-hubble-space-telescope-gyroscope-failure
https://www.cbsnews.com/news/hubble-space-telescope-in-safe-mode-after-gyro-failure/
https://www.space.com/42063-hubble-telescope-malfunction-nasa-response.html
https://edition.cnn.com/2018/10/09/health/hubble-repairs-intl/index.html
https://www.nasa.gov/feature/goddard/2018/hubble-in-safe-mode-as-gyro-issues-are-diagnosed