NASA's Voyager 1 spacecraft is talking nonsense. Its friends on Earth are worried

This artist's impression shows one of the Voyager spacecraft moving through the darkness of space. (NASA/JPL-Caltech)

The last time Stamatios "Tom" Krimigis saw the Voyager 1 space probe in person, it was the summer of 1977, just before it launched from Cape Canaveral, Florida.

Now Voyager 1 is over 15 billion miles away, beyond what many consider to be the edge of the solar system. Yet the on-board instrument Krimigis is in charge of is still going strong.