What drew you to try to explain the anomaly, the unexpected slowing of the Pioneer 10 and 11 spacecraft that emerged in the 1980s? The whole solar system is a lab which I use to test general relativity. We know the solar system obeys all laws given to us by Einstein and Newton. With the Pioneer anomaly, suddenly we saw a very unusual tiny force that fell right in between Newton's gravity and Einstein's general relativity. That prompted people to think that maybe the spacecraft was sensing the presence of a new type of physics.
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