The Sun

Main sequence stars are the most common type of stars, including our Sun. They fuse hydrogen into helium in their cores, releasing energy that provides light and heat. These stars vary in size, temperature, and brightness and are classified into types O, B, A, F, G, K, and M. The lifespan of a main sequence star depends on its mass. Larger stars burn through hydrogen quickly and have shorter lifespans, while smaller stars, like red dwarfs, can last billions of years. After exhausting their hydrogen, stars evolve into later stages, such as red giants or supernovae. Studying main sequence stars is essential for understanding stellar evolution and galaxy formation.