Hubble Telescope resumes science operations after gyroscope glitch

An image of the Hubble Space Telescope hovering in Earth's orbit.
The Hubble Space Telescope in orbit. (Image credit: NASA)

Update for Dec. 13: This post has been updated to include the most recent information from NASA.

Following a string of setbacks concerning one of its directional instruments, the Hubble Space Telescope has now resumed its job of capturing deep space images.

In a statement posted Dec. 8 to the Hubble space telescope blog, NASA confirms that the iconic observatory has resumed science operations. "The spacecraft is in good health and once again operating using all three of its gyros," the statement reads.

The telescope's issues all began on Nov. 19, when one of the iconic observatory's three gyroscopes (a trio that live on from an original set of six) began providing faulty readings. In general, gyroscopes are devices that use either circulating beams of light or rapidly spinning wheels to help scientists make sure an object is facing the direction they want it to face. Incorrect gyroscope readings on the Hubble telescope, as you might imagine, can therefore drastically affect science measurements. To image a specific spot in deep space with this Earth-orbiting telescope, you'd have to make sure it's actually facing that spot in deep space. 

Related: Hubble Telescope revisits gorgeous spiral galaxy, offering a newly filtered view (photo)

Thus, Hubble entered safe mode on Nov. 19 — something that's programmed to happen automatically when certain issues arise with the observatory. The team, however, was able to bring it back online the following day. But things weren't looking good shortly after, when gyro issues sent Hubble into yet another safe mode situation on Nov. 21. The team brought Hubble back once more shortly after that, only for the beloved telescope to retreat into its dark corner once again on Nov. 23. 

That most recent safe mode entrance was slightly worrying as it persisted for longer than the previous two dips. It wasn't too worrying though because, first of all, this isn't the first time Hubble's gyros have raised issues leading to a shutdown. And secondly, maybe most importantly, the observatory can actually function with only one gyroscope. The team just uses three because it maximizes efficiency. 

Though it's been over three decades since Hubble began exploring the vibrant reaches of our universe — and though a new observatory in town has been catching most of the spotlight recently — this Reynolds-wrap-looking telescope is surely not finished yet.

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Monisha Ravisetti
Astronomy Channel Editor

Monisha Ravisetti is's Astronomy Editor. She covers black holes, star explosions, gravitational waves, exoplanet discoveries and other enigmas hidden across the fabric of space and time. Previously, she was a science writer at CNET, and before that, reported for The Academic Times. Prior to becoming a writer, she was an immunology researcher at Weill Cornell Medical Center in New York. She graduated from New York University in 2018 with a B.A. in philosophy, physics and chemistry. She spends too much time playing online chess. Her favorite planet is Earth.