What is Moon?

The Moon is the natural satellite of Earth. It appears bright in the sky because it reflects sunlight.

Why do we see the same side?

The Moon takes approximately the same time to rotate on its axis as it does to orbit Earth. As a result, we see largely the same side from Earth.

Phases of the Moon

Seeing the illuminated part of the Moon from different angles produces phases such as new moon, first quarter, full moon and last quarter. These phases are not normally caused by the shadow of Earth.