The Sun is the star at the heart of our solar system. Its gravity holds the solar system together, keeping everything — from the biggest planets to the smallest bits of debris — in its orbit.

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Sun, star around which Earth and the other components of the solar system revolve. It is the dominant body of the system, constituting more than 99 percent of its entire mass.

The sun is an ordinary star, one of about 100 billion in our galaxy, the Milky Way. The sun has extremely important influences on our planet: It drives weather, ocean currents, seasons, and climate, and makes plant life possible through photosynthesis.

Read about the history and future of Earth’s sun as well as fun facts about the sun’s age, size, temperature, and phenomena like solar flares.

Earth's sun: Facts about the sun's age, size and history | Space

A clear guide to the Sun’s age, life cycle, and eventual fate. Learn how scientists measure its age and what will happen when the Sun reaches its final stages.

How Old Is the Sun and When Will It Die? Understanding Its Life Cycle ...