In the 1970s, NASA launched the Pioneer 10 and 11 probes. Soon, scientists realized that they were veering way off course, and in the 1990s, they set out to determine why. But how do you investigate a 20-year-old spacecraft that's hundreds of thousands of kilometers away? Find out how they uncovered the mystery in the video below.
What Set The Pioneer Probes Off Course?
To figure it out, researchers had to be incredibly resourceful.
When Pioneer 10 Met Jupiter
Hear about the probe's maiden voyage.
Our Space Probes Come With Messages To Distant Worlds
Every probe we've launched, including Pioneer 10 and 11, included a plaque engraved with a message telling others about human existence.
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