Why do you think the moon is turned to the earth with only one side and we never see the other?

The Earth’s satellite, the Moon, makes a complete revolution around the Earth in an elliptical orbit in 27.32 days. In exactly the same time, the Moon turns around its axis. Therefore, our satellite is always turned to us with one side.
But such a rotation of the Moon relative to the Earth in our solar system is not unique. So Mercury is turned to the Sun also always with one side. Some moons of Saturn and Jupiter do not rotate in relation to their planet.