In this episode, we investigate the mysterious deceleration observed in the Pioneer 10 and 11 spacecraft that challenged our understanding of deep space navigation. Our hosts examine the precise tracking data that revealed an unexplained sunward acceleration of approximately 8.74 × 10−10 m/s², which couldn't be explained by known gravitational forces or spacecraft systems. We explore the decades-long investigation involving multiple research teams, the proposed theoretical explanations ranging from modified gravity to dark matter effects, and how the eventual resolution through thermal radiation pressure revolutionized our approach to deep space mission design and highlighted the complexity of space navigation.

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