NASA confirmed that after a break in communications with Voyager 1 in late October, the spacecraft regained its voice and resumed normal operations.
Voyager unexpectedly turned off its main radio transmitter, known as X-band, before turning on its much weaker S-band transmitter in October.
The interstellar spacecraft is currently located approximately 25.4 billion kilometers from Earth and the S-band has not been used in more than 40 years.
Communication between NASA and Voyager 1 has been spotty at times, and the shift to lower band has prevented the Voyager mission team from downloading science data and information about the spacecraft's status.
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Earlier this month, the team was able to reactivate the X-band transmitter and resume collecting data from the four operational science instruments aboard Voyager 1.
Now that data can be collected and communications have resumed, engineers are completing a few remaining tasks to return Voyager 1 to the state it was in before the problem occurred. One task is to reset the system that synchronizes Voyager 1's three onboard computers.
The S-band was activated by the spacecraft's fault protection system when engineers activated a heater on Voyager 1. The fault protection system determined that the probe did not have enough power and automatically turns off systems that were not needed to keep the spacecraft in flight in order to continue powering critical systems.
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But in doing so, the probes turned off all nonessential systems except scientific instruments, NASA said, turning off X-band and activating S-band, which uses less power.
Voyager 1 had not used S-band to communicate with Earth since 1981.
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Voyager 1's odyssey began in 1977, when the spacecraft and its twin, Voyager 2, were launched on a tour of the solar system's gas giant planets.
After returning dazzling postcard views of Jupiter's giant red spot and Saturn's shimmering rings, Voyager 2 headed toward Uranus and Neptune. Meanwhile, Voyager 1 used Saturn as a gravitational slingshot to propel itself past Pluto.
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There are 10 scientific instruments on each spacecraft and, according to NASA, four are currently used to study particles, plasma and magnetic fields in interstellar space.