Sun - Wikipedia
The Sun does not have a definite boundary, but its density decreases exponentially with increasing height above the photosphere. [34] For the purpose of measurement, the Sun's radius is considered to be the distance from its centre to the edge of the photosphere, the apparent visible surface of the Sun. [35] The roundness of the Sun is the relative difference between its radius at its equator ...

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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.

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. The Sun is the source of an enormous amount of energy, a portion of which provides Earth with the light and heat necessary to support life.

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Sun 101 | National Geographic - YouTube
The sun keeps the planets in its orbit with a tremendous gravitational force. What would happen if it disappeared entirely? Learn about the star at the cente...

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