Earth-Moon Relationship

The moon does rotate, but the time it takes to rotate around its axis is exactly equal to the time it takes to orbit the Earth and as a consequence, we always see the same side of the Moon. This isn’t a coincidence but this happens due to “tidal locking”, which causes the rotation of an object to sync up with its orbit. The tidal force from the Moon isn’t just making the seas and oceans move around, it also pulls at the solid bits of the Earth, ever so slightly slowing down the rotation of the Earth. If the Sun wouldn’t gobble up the Earth when it expands in 4-5 billion years, then some 50 billion years from now the Earth would be tidally locked to the Moon at which point the same side of the Earth would always be facing the Moon and the length of a day would be much longer than the 24 hours it is now.