Yes, there are nights when the moon is not in the sky. This happens during a new moon phase.

Here's why:

* The Moon's Orbit: The moon orbits the Earth, and its position relative to the sun changes.

* New Moon Phase: During the new moon phase, the moon is positioned between the Earth and the sun. This means the sunlit side of the moon faces away from Earth, making it invisible to us.

While we don't see the moon during a new moon, it's still there, just hidden from our view.