Science Question:

Why does the same side of the moon always face Earth?

The rotational period of the moon is different than one revolution around Earth.

The rotational period of the moon is equal to one revolution around Earth.

The rotational period of Earth is the same as that of the moon.

The rotational period of Earth is equal to one revolution around Earth.

The rotational period of the moon is equal to one revolution around Earth.

I think this is the answer am not that positive.

Explanation

Only one side of the Moon is visible from Earth because the Moon rotates on its axis at the same rate that the Moon orbits the Earth - a situation known as synchronous rotation, or tidal locking. The Moon is directly illuminated by the Sun, and the cyclically varying viewing conditions cause the lunar phases.