The Moon does not rotate on its axis. The Moon is not visible during the day. The Moon has phases that coincide with its rate of rotation. The Moon rotates at the same rate that it revolves around Earth.
I gave my students this multiple choice question: Why has only one-half of the Moon ever been observed from Earth?

Only one answer is correct among these 4 choices:
- The Moon does not rotate on its axis.
- The Moon is not visible during the day.
- The Moon has phases that coincide with its rate of rotation.
- The Moon rotates at the same rate that it revolves around Earth.

Could you tell me which one is correct?

The Moon rotates at the same rate that it revolves around Earth.