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Alex,
The evidence for GR is, if anything, increasing. The anomalies with the Pioneer craft probably have nothing to do with GR. They remain a mystery and several explanations have been proposed, from gas leakage to dark matter, modified gravity (MOND) to simply errors in measurement and recording over a long time period (30 years of data). One would be wise not to draw any rash conclusions without other corroborating evidence.
Regards, Rob.
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