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Voyager 1 Just Activated a Radio That's Been Offline Since 1981
The trouble began on October 16, when NASA beamed a command to Voyager 1 to turn on one of its heaters. An innocent enough request, but the spacecraft responded by ghosting Earth.
It actually took the agency two full days to notice the issue. That's because Voyager 1 is the most distant human-made object, and being almost 25 billion kilometers (15.3 billion miles) away, it takes nearly 23 hours for a message to get there – even at the speed of light – and another 23 hours for a response.