Space Exploration

The Mystery That Set The Pioneer Probes Off Course

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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.

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