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The trouble with Hubble.

It’s down to just three of the six gyroscopes NASA upgraded it with in 2009 — and one of those is flaking out. According to Ars Technica, the agency’s engineers figured out a way to keep the Hubble going on a single gyro.

In this one-gyro mode, Hubble’s control system would receive inputs from the single gyroscope in combination with magnetometers, Sun sensors, and star trackers.

Unfortunately, it’s also got issues with one of its guidance sensors, and its orbit is decaying, putting it a little over a decade from falling out of the sky. NASA and SpaceX have studied whether they can push it farther out again.