Sun

Our Sun, the 5-billion-year-old star that sustains life here on Earth, powers photosynthesis in green plants and is ultimately the source of all food and fossil fuel. The connection and interaction between the Sun and Earth drive the seasons, currents in the oceans, weather and climate. With a core reaching a fiery 16 million degrees Kelvin (nearly 29 million degrees Fahrenheit), the Sun's surface temperature is so hot that no solid or liquid can exist there. Luckily for humans, Earth is a little less than 150 million kilometers (93 million miles) away from the Sun. Although its interior has been modified by nuclear reactions, the outer layers of the Sun are composed of very nearly the same material as the original solar nebula.

As the star for nine planets, a multitude of asteroids, comets and other celestial objects, the Sun contains more than 99 percent of the entire mass in the solar system.

Diameter	1,390,000 km (863,706 miles
Mean Distance from Earth	149,597,890 km (9.30 x10⁷ miles) or 1 astronomical unit
Age of Sun	4.5 - 4.7 x 10^{9 years}
Volume (Earth=1)	1.412 x 10³³
Mass	1.99 x 10³⁰ kg (7.02 x 10³¹ ounces) or 332,830 (Earth = 1)
Density	1.41 gm/cm³
Surface gravity	28 (Earth = 1)
Length of day or Differential Rotation	25.38 Earth days. At the equator the surface rotates once every 25.38 Earth days; near the poles it's as much as 36 Earth days.
Temperature	5,503.85° C (9,935.93° F)

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