The volume of the Moon is approximately 2.1958 × 10¹⁰ cubic kilometers (5.26 × 10¹⁰ cubic miles).

Here's how that number is calculated:

* The Moon's radius: The Moon's average radius is about 1,737.1 kilometers (1,079.6 miles).

* The formula for the volume of a sphere: The volume of a sphere is calculated using the formula (4/3)πr³, where r is the radius.

So, plugging in the Moon's radius into the formula:

Volume = (4/3)π(1737.1 km)³ ≈ 2.1958 × 10¹⁰ cubic kilometers