Plenty can go wrong when you're floating through interstellar space, billions of miles from Earth, running on a radioisotope thermoelectric generator and coming up on 43 years since the last time anyone laid a spanner on you. Last week, Voyager 2 shut itself down into a safe mode after an unexplained delay in a calibration maneuver caused two high-powered systems to come on at the same time, overdrawing the power supply.

Figuring out what went wrong and deciding what to do next was a laborious process, mainly because communications to and from Voyager, traveling at the speed of light, take 17 hours each way. So, any time you give this extraordinary spacecraft a command, you need to wait about 34 hours before you know if it had the desired effect.

Now, NASA has announced that it's turned Voyager 2's scientific instruments back on and resumed collection of scientific data. The rest of the craft is still under review, and the team is slowly running diagnostics to determine when everything else can be switched back on.

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https://newatlas.com/space/voyager-2-back-online/