Since the antenna points Sunward, towards Earth, reflections off its back would tend to decelerate the spacecraft. "The radiation from this wall will, in a ﬁrst iteration, reﬂect off the antenna and add a contribution to the force in the direction of the sun," say Francisco and co.
Lo and behold, this extra component of force makes all the difference. As Francisco and co put it: "With the results presented here it becomes increasingly apparent that, unless new data arises, the puzzle of the anomalous acceleration of the Pioneer probes can ﬁnally be put to rest."
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