Here's why:

* Atmosphere: Earth's atmosphere is a layer of gases that surrounds our planet. It's held in place by gravity.

* Moon's Orbit: The Moon orbits Earth, but it's much farther away than the extent of Earth's atmosphere.

* Vacuum of Space: The space between Earth and the Moon is a near-perfect vacuum, meaning it's essentially devoid of air.

So, the Moon is definitely outside Earth's atmosphere.