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... Voyager 1 gave controllers the silent treatment for a few days this month before resuming communication weeks before the spacecraft reaches the one-light-day milestone.

The incident happened on October 18: NASA's Deep Space Network (DSN) couldn't detect a signal from the probe. On October 19, on the next scheduled communication attempt, there was still nothing. Was this it? Had the decades-long galactic venture finally ended?

Things are operating on a knife's edge for the two veteran spacecraft, which will reach their half-century next year. Voyager 2 suffered an antenna pointing issue in 2023, and a low power condition caused Voyager 1 to unexpectedly turn off one of its two radio transmitters.

The good news is that on October 20, the signal reappeared, leaving engineers wondering why Voyager 1 temporarily went silent.

Thus far, it seems a group of thrusters went offline and their backups were turned on. This could indicate onboard computers detected a problem and put the spacecraft into a safe mode.

Kareem Badaruddin, Voyager mission manager at NASA's Jet Propulsion Laboratory, said: "This is the first time we've seen the spacecraft do something like this, but we are also at a point in the mission where we have to expect the unexpected.

"We're relieved to be back in contact with Voyager 1 and are eager to understand what happened." ...