Voyager 2 rocketed into space in 1977, along with its identical twin Voyager 1, on a quest to explore the outer planets.
Still communicating and working fine, Voyager 1 is now 24 billion kilometres from Earth, making it the most distant spacecraft.
Voyager 2 trails its twin in interstellar space at more than 19 billion kilometres from Earth. At that distance, it takes more than 18 hours for a signal to travel one way.
AP
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