Our Sun is a yellow dwarf star. Its official designation is as a G V star.
Stars in the this classification have a surface temperatures between 5,300 and 6,000 K and fuse hydrogen into helium to generate their light. They generally last for 10 billion years. G V Stars can experience several different stages. Some are newly formed, others in their middle years, while the remainder are nearing the end of their lives.
Our Sun is middle aged; a stage known as the main sequence. It has existed for approximately 4.3 billion years, and will likely last another 7 billion. After that, it will expand nearly to the Earth’s orbit and become a red giant for a relatively short time, then shrink back down to become a white giant.
