The Sun is the center of the Solar System. The 8 planets and asteroids orbit around this star. The Sun is so huge that it could fit over 1 million Earths inside of it! The sun is a star. Stars are giant balls of gas in space. The stars are very hot! They can be up to 800,000°F! Our own Sun is also a star. It supplies us with light and heat. A star is filled with gases called Hydrogen and Helium. The star has a lot of gravity, so the star smashes the Hydrogen molecules together to create Helium! The molecules in the Hydrogen actually fuse together to make a new gas called Helium. This process is how the star radiates out heat, light, and charged particles. The Sun is so big because it is a giant group these gases!