The sun is large enough that approximately 1.3 million Earths could fit inside. Want to check our math? The volume of the sun is 1.41 x 1018 km3, while the volume of Earth is 1.08 x 1012 km3. If you divide the volume of the sun by the volume of the Earth, you get that roughly 1.3 million Earths can fit inside the sun. However, this assumes that the Earths are squished together without leaving any empty space. Scientists estimate that if the Earths retained their spherical shape, only about 960,000 would fit because of wasted space in between the spheres.
Of course, the Sun is a fairly average sized stars. There are some enormous stars out there. For example, the red giant Betelgeuse has a radius of 936 times the radius of the Sun. That gives it hundreds of millions of times more volume than the Sun.
And the largest known star is VY Canis Majoris, thought to be between 1800 and 2100 times the radius of the Sun.
Picture Credit : Google
