NASA's Voyager 1 spacecraft, currently about 15 billion miles from Earth, has given scientists a bit of a scare. On October 17, it switched its main radio transmitter to a different frequency, leaving NASA's Jet Propulsion Laboratory team scratching their heads. The spacecraft's Fault Protection System, designed to keep Voyager 1 safe, was triggered by a command sent on October 16. This command was meant to turn on a heater, but instead, it caused the spacecraft to switch to a backup frequency that hasn't been used since 1981. This frequency sends a very faint signal, like a whisper from the vast darkness of space.

NASA engineers quickly figured out the issue and started listening on the new frequency. Everything seemed stable for a short while. Then, surprisingly, Voyager 1 went silent again on October 19. The Fault Protection System had switched off the main transmitter and turned on the old S-band transmitter. This transmitter uses less power and sends a much fainter signal.

The team is now using this old transmitter to communicate with Voyager 1. They hope to find out why the Fault Protection System is acting up and switch back to the main transmitter. It's like trying to communicate with a spooky old house that keeps changing its mind!

Voyager 1 Switches to an Old Signal, Leaving NASA Puzzled

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