Sun - Wikipedia
It is a massive sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy from its surface mainly as visible light and infrared radiation, with 10% at ultraviolet energies. It is the main source of energy for life on Earth.

Sun - NASA Science
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 - National Geographic Society
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.

Sun: Facts - NASA Science
The Sun is about 100 times wider than Earth and about 10 times wider than Jupiter, the biggest planet. The Sun is the only star in our solar system. It is the center of our solar system, and its gravity holds the solar system together. Everything in our solar system revolves around it – the planets, asteroids, comets, and tiny bits of space ...

Sun | Definition, Composition, Properties, Temperature, & Facts ...
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.

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Sun - Simple English Wikipedia, the free encyclopedia
The Sun is a type of star called a G-type main-sequence star, sometimes nicknamed a yellow dwarf, even though its light is actually white, not yellow. It looks yellow because of the atmosphere.

All About the Sun | NASA Space Place – NASA Science for Kids
Without light from the Sun, there would be no plants or animals—and, therefore, no food and we wouldn’t exist. Heat and light might be important for life on Earth, but the Sun sends other stuff, too.

In Depth | Sun – NASA Solar System Exploration
Without the Sun’s energy, life as we know it could not exist on our home planet. From our vantage point on Earth, the Sun may appear like an unchanging source of light and heat in the sky. But the Sun is a dynamic star, constantly changing and sending energy out into space.