About 1.3 million Earths could fit inside the Sun by volume if Earth were a liquid that could perfectly fill the space

. This estimate comes from dividing the Sun’s volume (approximately 1.41×10181.41\times 10^{18}1.41×1018 cubic kilometers) by Earth’s volume (about 1.08×10121.08\times 10^{12}1.08×1012 cubic kilometers)

. However, since Earth is a solid sphere, packing many Earth-sized spheres inside the Sun leaves empty space between them. Accounting for this packing inefficiency, more precise simulations estimate that about 930,000 whole Earths could fit inside the Sun

. This lower number reflects the realistic packing density of spheres inside a larger sphere, which is about 72%. In summary:

• By volume ratio alone (liquid approximation): ~1.3 million Earths fit in the Sun.
• By realistic packing of solid spheres: about 930,000 Earths fit inside the Sun.

Both figures illustrate the immense size difference between the Sun and Earth, with the Sun’s diameter about 109 times that of Earth