I’m a real hottie! The temperature at my center is a sizzling 15,000,000 Kelvin and on my surface 6,000 Kelvin. I am the star located at the center of your Solar System and I am one among an estimated 200-400 billion stars orbiting in the Milky Way Galaxy. I am composed of mostly hydrogen and helium with trace amounts of other elements. All my energy is produced in my core by nuclear fusion. This energy travels to the surface and is emitted as visible light reaching the Earth in 8 minutes.