* Volume: We'll compare the volumes of the Sun and Mars. Volume is a measure of how much space an object takes up.

* Formulas:

* Volume of a sphere = (4/3) * π * (radius)^3

Let's get the numbers:

* Sun's Radius: 695,000 kilometers

* Mars' Radius: 3,390 kilometers

Calculations:

1. Sun's Volume: (4/3) * π * (695,000 km)^3 ≈ 1.41 x 10^18 cubic kilometers

2. Mars' Volume: (4/3) * π * (3,390 km)^3 ≈ 1.63 x 10^11 cubic kilometers

3. Sun's Volume / Mars' Volume: (1.41 x 10^18 km^3) / (1.63 x 10^11 km^3) ≈ 8650

Answer: You would need approximately 8650 Mars-sized planets to equal the volume of the Sun.