The reason you might think it's gone is because of its phases:
* New Moon: The moon is between the Earth and the Sun, so we can't see it.
* Waxing Crescent: A sliver of the moon becomes visible, growing larger each night.
* First Quarter: Half of the moon is visible, and it looks like a quarter circle.
* Waxing Gibbous: More than half of the moon is visible, getting rounder each night.
* Full Moon: The entire moon is visible, and it looks like a full circle.
* Waning Gibbous: The moon starts to shrink, getting smaller each night.
* Last Quarter: Half of the moon is visible again, but now it looks like a quarter circle on the other side.
* Waning Crescent: The last sliver of the moon is visible, getting smaller each night.
The moon goes through these phases approximately every 29.5 days. You can find a lunar calendar online to see when the next new moon or full moon will be.
