The document summarizes key aspects of the sun including its internal layers, surface features, composition, and other characteristics. The sun's core fuses hydrogen into helium through nuclear fusion. Surrounding layers include the radiation and convection zones that circulate energy. Surface features like sunspots and solar flares are caused by magnetic activity. The sun accounts for 99% of the mass in the solar system and is about 4.5 billion years old.

1. The Sun By Mrs. Allen

2. I. Layers of the Sun The Core: The center of the sun where fusion takes place. Radiation zone: energy flows from core. Convection zone: energy circles back toward core and is then pushed back out by energy coming from radiation zone.

3. I. Layers of the Sun Photosphere: The layer from which light is given off. Chromosphere: The layer that extends above the photosphere. Corona: Largest layer of the suns atmosphere and extends millions of km.

4. II. Parts of the Sun Sunspots: Cool areas around the sun which are not permanent. 1. Caused by Magnetic Fields. 2. High numbers occur every 11 years. 3. Occur in pairs. 4. When 2 sunspots come together, prominences and flares are produced.

5. II. Parts of the Sun Prominences: Huge arching columns of gas. Flares: Violent eruptions shooting outward from the sun at high speeds.

6. III. Characteristics of the Sun 99% of all the matter in our solar system is in the sun. The sun is the center of the solar system. The sun is a main-sequence star. The sun produces energy by fusion. 75% Hydrogen and 25% Helium fuse in the core. Fusing means two atoms combine to form a heavier atom.

7. IV. Interesting Facts The sun is a G2 star. The temperature of the core is 15.6 million Kelvin. The sun is approximately 4.5 billion years old. The sun emits a low-density stream of charged particles known as the solar wind. Our sun is unique, not part of a binary system, 2 stars orbiting each other.