energy and angular momentum exchange. In particular， Venus and Earth make a typical pair. In the figures， they show negative correlations in exchange of energy and positive correlations in exchange of angular momentum. The negative correlation in exchange of orbital energy means that the two planets form a closed dynamical system in terms of the orbital energy. The positive correlation in exchange of angular momentum means that the two planets are simultaneously under certain long-term perturbations. Candidates for perturbers are Jupiter and Saturn. Also in Fig. 11， we can see that Mars shows a positive correlation in the angular momentum variation to the Venus–Earth system. Mercury exhibits certain negative correlations in the angular momentum versus the Venus–Earth system， which seems to be a reaction caused by the conservation of angular momentum in the terrestrial planetary subsystem.
It is not clear at the moment why the Venus–Earth pair exhibits a negative correlation in e
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