Two weeks ago, the Hubble telescope experienced a gyroscope failure.
Hubble has been very important, and has contributed enormously to our understanding of the universe. This is a hugely expensive device, which has had problems in the past. It's up in space where you can't exactly get someone to go and hit it with a hammer in hopes it'll start working again.
NASA has tried a number of sophisticated procedures to get Hubble functioning again. They haven't worked.
Now NASA has turned it off, and back on again.
Hubble is working again ...
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