Sun is a:

🧠 Explanation:

The Sun is a star, a massive, luminous sphere of plasma at the solar system’s center. Composed of hydrogen and helium, it drives nuclear fusion, producing energy vital for Earth’s climate and life. Classified as a G-type main-sequence star, it accounts for 99.86% of the solar system’s mass, governing planetary orbits. Its 4.6-billion-year lifespan fuels ongoing scientific study, revealing insights into stellar evolution and cosmic dynamics. The Sun’s role in sustaining ecosystems through photosynthesis underscores its importance, making it a focal point in astronomy and environmental science for understanding life’s origins.