The moon is tidally locked to earth, we only ever see one side.
To add: this happens because the parts of the Moon that are closer to the Earth are pulled in more by Earth's gravity, compared to the ones further away.
Is it 2-way? I guess moon see all around earth, or no?
To add: this happens because the parts of the Moon that are closer to the Earth are pulled in more by Earth's gravity, compared to the ones further away.