The moon that lies between the Sun and Earth during a new moon phase has its dark side facing us and is therefore not visible.

Here's why:

* Lunar Phases: The moon's phases are caused by the changing angles of sunlight reflecting off its surface as it orbits the Earth.

* New Moon: During a new moon, the moon is positioned between the Sun and Earth. The side of the moon facing the Earth is the same side facing away from the Sun, making it completely dark and invisible.

* Dark Side: It's important to note that the term "dark side" of the moon is a bit misleading. Both sides of the moon receive sunlight, just at different times during its orbit.

Let me know if you have any other questions!