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Sun

The Sun: The Basics
The sun is a star, a hot ball of glowing gases at the heart of our solar system. Its influence extends far beyond the orbits of distant Neptune and Pluto. Without the sun's intense energy and heat, there would be no life on Earth. And though it is special to us, there are billions of stars like our sun scattered across the Milky Way galaxy. If the sun were as tall as a typical front door, the Earth would be the size of a U.S. nickel. The temperature at the sun's core is about 27 million degrees Fahrenheit.

Average diameter : 864,000 miles, about 109 times the size of the Earth.
Rotation period at equator : About 27 days.
Rotation period at poles : About 36 days.
Surface temperature : 10,000 degrees Fahrenheit.
Composition : Hydrogen, helium.
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Interesting facts
If the Sun were as tall as a typical front door, Earth would be about the size of a nickel.​
The Sun is the center of our solar system and makes up 99.8 percent of the mass of the entire solar system.
At the equator, the Sun spins once about every 25 days, but at its poles the Sun rotates once on its axis every 35 Earth days.
As a star, the Sun is a ball of gas (92.1 percent hydrogen and 7.8 percent helium) held together by its own gravity.
The Sun does not have any rings.
Without the Sun's intense energy, there would be no life on Earth.
The Sun's core is about 27 million degrees Fahrenheit (15 million degrees Celsius)
But orbited by eight planets, at least five dwarf planets, tens of thousands of asteroids, and up to three trillion comets and icy bodies.
The Sun’s visible surface sometimes has dark sunspots, which are areas of intense magnetic activity that can lead to solar explosions.
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The sun has an age of 4.5 billion years and is 100 million times as large as Earth. Yet it is quite a mediocre star on the universe scale. For humans, the sun is invaluable.

The sun consists of hot hydrogen and helium. At the heart of the sun huge amounts of energy are released. Even the smallest differences in the Earth's distance to the Sun mean significant temperature differences. Without the Sun the Earth would be lifeless.
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