Star: A Celestial Body of Nuclear Fusion | Golden Age

A star is a massive, luminous sphere of plasma held together by its own gravity, with the Sun being the closest example to Earth. The life cycle of a star, which can range from a few million to billions of years, depends on its mass, with more massive stars having shorter lifetimes. The process of nuclear fusion within the core of a star is what generates its immense energy output, with the most common fusion process being the proton-proton chain reaction. Stars are classified based on their spectral type, which is determined by their surface temperature, with the most common types being O, B, A, F, G, K, and M. The study of stars has been a cornerstone of astronomy, with significant contributions from figures like Galileo Galilei and Edwin Hubble. As technology advances, our understanding of star formation, evolution, and death continues to evolve, with ongoing research into exoplanets and the search for life beyond Earth.