1. Chapter 26 The Sun The Sun Is a star Is a main sequence star
1 million Earth’s would fit inside the sun
1.4 million kilometers from earth

2. Hertzberg- Russel Diagram
Shows stars in their different stages

4. The union of hydrogen atoms into helium
4H = 1 He
What happens when a star runs out of its fuel – hydrogen?
It either becomes a red giant or a supergiant
Our sun will become a red giant
Fuel for the Sun is Fusion..

5. Star life cycle

6. Sun’s layers Core Photosphere Chromosphere
15,600,000 oC – dense! The apparent bright yellow surface of the sun Outer layer around the photosphere – reddish appearance; where solar prominences occur
Sun’s layers
Core
Photosphere
Chromosphere

7. Corona
Thin outer atmosphere….only part of the sun visible during a total solar eclipse

8. Solar Prominences
Solar Prominences

9. Solar Flare
Strong magnetic storm on the surface of the sun – thousands of miles tall!

10. Sunspots
Dark spots on the photosphere
Areas of high magnetic field X stronger
They appear to move so they gave proof that the sun rotates

11. Flow of electrically charged particles off of the sun (p+ and e-)
Cause auroras
Solar Prominences

12. What is the center of our solar system?
Geocentric
Ptolemy’s theory of an Earth-centered solar system
Geo – mean EARTH
-centric means CENTERED
Early astronomers thought that everything revolved around the earth – WRONG!!!!!!

13. Heliocentric
Copernicus’ idea of a sun-centered solar system