The celestial body at the center of our solar system is the Sun. The Sun is a nearly perfect sphere of hot plasma, composed mainly of hydrogen and helium, and it accounts for about 99.86% of the total mass of the solar system. It is the primary source of energy for Earth, driving weather patterns and supporting life through photosynthesis. The Sun's immense gravitational force keeps the planets, including Earth, and other objects like asteroids and comets in orbit. Its surface temperature reaches approximately 5,500 degrees Celsius, while the core reaches over 15 million degrees Celsius, powering nuclear fusion processes that generate light and heat.