Is it known how gravity works to cause our moon to constantly face us?
Wikipedia says this:
"Tidal locking occurs when the long-term interaction between a pair of co-orbiting astronomical bodies drives the rotation rates into an harmonic ratio with the orbital period. This effect arises from the gravitational gradient (tidal force) between the co-orbiting bodies, acting over a sufficiently long period of time. Once tidal locking is achieved for one of the bodies, there is no more net transfer of angular momentum between the two objects, although there can be some back and forth transfer over the course of an orbit. In the special case where the orbital eccentricity is nearly zero, tidal locking results in one hemisphere of the revolving object constantly facing its partner, an effect known as synchronous rotation."
I was not smart enough to understand that. For those of you who understand, do you know if that author was stating what is considered in the scientific community to be known fact, or is it a theory, or is it only speculative guessing?