One of the mysteries of current astronautics is the so-called ‘flyby anomaly’. This name is given by the strange acceleration experienced by some probes when performing a gravitational assist maneuver to change its speed around the Sun. The difference between the predicted speed and the measured speed is almost negligible, of the order of millimeters per second, and has not had consequences for no mission. But, however small it may be, the difference is not null and must be explained.

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