1. Sun Lesson 3

2. Sun The sun is a star located at the center of our solar system. The nearest star from earth and our engine for life. It is a medium-sized yellow star. It contains 99.85% of all matter in the solar system

3. Characteristics of the Sun

4. Sun’s Structure It has four-part: – Core, photosphere, chromosphere, corona Each layer has its own characteristics such as its temperature and density.

5. Sun’s PartsDescription CoreWhere the nuclear reaction occur PhotosphereThe surface of the sun where it produces the visible light ChromosphereJust above the chromosphere, a red glowing region of gas. coronaThe outermost and stretches out 1 million km into space

6. Phenomena at the Sun’s Surface The Sun’s magnetic field controls the motion of gases in the corona, creating delicate streamers which are seen from the Earth as flares and arching prominences.

7. Solar flares – Huge Outburst! The explosive event on the solar surface. Prominences – masses of glowing gas above the Sun’s bright surface. Sunspots – darker patches! They are cooler that the surrounding regions of the photosphere. Solar wind – often give off ultraviolet light and x-rays that heat up the earth’s upper atmosphere.

8. Generation of Energy by the Sun The sun generates its energy through a nuclear fusion Fusion occurs at the center of the sun Hydrogen atoms collide into each other and fuse into atoms of helium. Energy is release through this process!