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. Prominences: Huge arching columns of gas.
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.