Here's why:

* Space is the vast emptiness that exists between celestial objects like planets, stars, and galaxies. It's a near-perfect vacuum with very little matter.

* The Moon is a natural satellite that orbits the Earth. It's a large, rocky body with a specific gravity, surface features, and atmosphere (very thin).

Think of it like this:

* Space is like the ocean - a vast expanse with no defined boundaries.

* The Moon is like an island - a distinct object within that ocean.

The moon exists in space, but it is not the same thing as space itself.