Scientists estimate that around 64.3 million moons would fit inside the sun. Earth's moon has a radius of around 1,080 miles and the sun has a radius close to 432,687 miles.
The sun is around 875,000 miles across and weighs around 300,000 times more than Earth. In fact, the sun is so large, that 1,600 Saturns could fit inside. By comparison, the Earth is only around 25,000 miles around.
Despite its enormity, the sun is not the largest star in the sky. There is a red giant called Betelgeuse, which is located in the Orion constellation, that scientists estimate is between 10 and 40 times the size of Earth's sun.