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The Sun is the star at the center of the Solar System. It is a nearly perfect sphere of hot plasma, with internal convective motion that generates a magnetic field via a dynamo process. It is by far the most important source of energy for life on Earth. Its diameter is about 1.39 million kilometers, i.e. 109 times that of Earth, and its mass is about 330,000 times that of Earth, accounting for about 99.86% of the total mass of the Solar System. About three quarters of the Sun's mass consists of hydrogen (~73%); the rest is mostly helium (~25%), with much smaller quantities of heavier elements, including oxygen, carbon, neon, and iron.

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Watch this video! It's so great and interesting. I still have that WOW effect after watching it.

Contributed by Dom Harris

This collage of solar images from NASA's Solar Dynamics Observatory (SDO) shows how observations of the sun in different wavelengths helps highlight different aspects of the sun's surface and atmosphere. (The collage also includes images from other SDO instruments that display magnetic and Doppler information.) Credit: NASA/SDO/Goddard Space Flight Center

Contributed by Kathryn Vercillo

Sun Primer: Why NASA Scientists Observe the Sun in Different Wavelengths

Contributed by Kathryn Vercillo

She Has the Whole Sun in Her Hands

How is that possible when...... The Sun contains 99.86% of the mass in the Solar System!!!!

Contributed by Vanessa Lam

What would happen if our star disappeared?

Contributed by Jasmine Moore

The size of the Sun compared to the planets is illustrated here. Kind of makes you feel small huh?

Contributed by Alyssa Green

Only 55% of Americans know the Sun is a star.

Contributed by Alyssa Green

A sun strorm known as coronal mass ejection (CME) occurred on May 1, 2013. On the surface of the sun, (CME) can kick up a billions of tons of solar material at the speed of a million miles per hour! A NASA spacecraft caught some of the action in this video.

Contributed by Alyssa Green

The sun gives us light and warmth. Our lives basically depend on it. Here are cool 10 interesting facts about the sun

Contributed by Aby Rodriguez

The sun is extremely powerful!

Contributed by Derek Lin

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