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... At 15.4 billion miles away from Earth in interstellar space, Voyager 1 won't last much longer.

In fact, NASA's flight engineers may have thought the 47-year-old mission had finally kicked the bucket when the uncrewed spacecraft recently went quiet. The probe had shut off its main radio transmitter for communicating with mission control.

Voyager's problem began on Oct. 16, when flight controllers sent the robotic explorer a somewhat routine command to turn on a heater. Two days later, when NASA expected to receive a response from the spacecraft, the team learned something tripped Voyager's fault protection system, which turned off its X-band transmitter. By Oct. 19, communication had altogether stopped.

The flight team was not optimistic.

However, Voyager 1 was equipped with a backup that relies on a different, albeit significantly fainter, frequency.

No one knew if the second radio transmitter could still work, given the aging spacecraft's extreme distance.

Days later, engineers with the Deep Space Network, a system of three enormous radio dish arrays on Earth, found the signal whispering back over the S-band transmitter. The device hadn't been used since 1981, according to NASA.

"The team is now working to gather information that will help them figure out what happened and return Voyager 1 to normal operations," NASA said in a recent mission update. ...