You are probably referring to the Pioneer anomaly, which was explained by thermal radiation. Alternative explanations exist, out of which MiHsC is my favorite as it gives also an explanation to the EM drive, galaxy rotation (no dark matter needed) and cosmic acceleration (no dark energy needed), and couple of other measurement anomalies out there;)
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You are probably referring to the Pioneer anomaly, which was explained by thermal radiation. Alternative explanations exist, out of which MiHsC is my favorite as it gives also an explanation to the EM drive, galaxy rotation (no dark matter needed) and cosmic acceleration (no dark energy needed), and couple of other measurement anomalies out there ;)
MiHsC has no adjustable parameters, and predicts cosmic acceleration and galaxy rotation without dark matter.
Be warned, the author's blog "Physics from the edge" has some quite good reads:
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