Afterwards, the spacecraft was receiving commands, buttalking back to Earth in unusable gibberish.
Voyager 1 is 15.14 billion miles away, which makes repairing it that much more complicated.
Two days later, the engineers heard back from the Voyager 1 spacecraft.
An artist’s concept of NASA’s Voyager 1 spacecraft.Illustration: NASA/JPL-Caltech
The probe ventured into interstellar space in August 2012, becoming the first spacecraft to leave the heliosphere.
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Members of the Voyager flight team celebrate after receiving the signal back from Voyager 1 on April 20.Photo: NASA/JPL-Caltech