Flybys may be key to Pioneer anomaly

By David Shiga The mystery surrounding the Pioneer anomaly has deepened. The unexplained changes in acceleration seen in NASA’s Pioneer 10 and 11 probes could be related to similarly odd shifts in the speed of other space probes, possibly pointing towards new physics. In the 1980s, researchers at NASA noticed that the Pioneer 11 spacecraft was slowing down more quickly than expected as it neared the edge of the solar system. The effect persisted until NASA lost touch with the spacecraft in 1995. A similar effect showed up in the Pioneer 10 spacecraft,
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