Here's why:

* Lunar Phases: The moon doesn't produce its own light. It shines because it reflects sunlight. The different phases of the moon we see are determined by the angle at which we see the sunlit portion of the moon.

* New Moon Position: During a new moon, the moon is positioned between the Earth and the Sun. This means the sunlit side of the moon is facing away from Earth, and the side facing us is in shadow.

* No Reflection: Since the sunlit side is facing away, no sunlight is reflected back to our eyes, making the new moon appear completely dark.

While the new moon itself is invisible, it's not always entirely dark in the sky. Sometimes, you might faintly see the moon due to:

* Earthshine: A faint glow on the new moon caused by sunlight reflected off the Earth onto the moon's surface.

* Atmospheric Conditions: Dust particles in the atmosphere can scatter sunlight, making the moon appear slightly brighter.

So, the next time you see a dark sky during a new moon, remember that it's not actually gone; it's just hiding behind the sun!