The Sun is the star of the well-known planet Earth. It is over 109x the size of the Earth, meaning a diameter of 1,392,784 km. It fuses Hydrogen into Helium for energy, and boy, meaning that this thing has tons of energy. A single solar flare has enough energy to cause a major blackout. It takes 24 days for it to rotate and it takes 235,000,000 years to orbit Sagittarius A*.