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Earth-moon migration

In this way, the mass of the earth decreases and the mass of the moon increases.

In addition, the increase in the mass of the moon is consistent with the decrease in the mass of the earth.

Gravity has f = GMM/r 2.

Now, if the big M smiles a value and the small M increases a value, gravity should increase.

The satellite period of revolution is positively correlated with the mass of the central celestial body (I believe the landlord will deduce it)

If the mass of the moon is still small compared with that of the earth, the period of revolution will be shorter.