The document discusses the structure and composition of the Sun. It has 6 layers: the core, where fusion occurs at 15 million degrees Celsius; the radiative zone, where energy moves by radiation; the convection zone, where hot gas currents transfer energy; the photosphere, the visible surface; the chromosphere, a thin pinkish layer; and the corona, the outermost low density layer. The Sun is mostly made of hydrogen and helium and produces energy through the fusion of hydrogen into helium. It contains over 99% of the mass in the solar system and has prominent features like sunspots and solar winds.

1. The Sun is our local star Space Science Chapter 4: Section 4.1

2. The sun:What is the sun made of? Is it a solid? A liquid? Or a gas? Gas- made mostly of hydrogen and helium

3. Is the Sun consistent? Or does it have layers? The sun has 6 layers

4. How does the sun make it’s energy? Fusion- the process in which hydrogen is converted into helium

5. Review: What is mass? Anything that has matter and takes up space

6. How massive is the sun? Contains 99.9% of the mass of the entire solar system

7. Layers of the sun

8. The sun’s interior Core Where fusion takes place Nuclear reaction, not chemical Reaches 15 million degrees Celsius Radiative Zone Energy moves by radiation through this thick layer Conditions not extreme enough for fusion to occur Convection Zone Convection- the transfer of energy from place to place by motion of heated gas or liquid the currents of this hot gas carry energy towards the Sun’s surface

10. -Radiative Zone

12. Sun’s atmosphere -Photosphere -Chromosphere -Cornoa

14. Sunspots Follow 11 year patterns During peak season, dozen of sunspots appear

15. The more sunspots there are, the cooler earth is.Why? NASA claims that in 2008 the sun had the fewest sunspots since 1913 and that is the reason for the cooler weather in the northern hemisphere.

16. Prominences Large bright features extending outward from the sun’s surface Anchored to the photosphere May be thousand of km in length

17. prominences Made of ionized gases called plasma

18. Solar winds Electrically charged particles that flow in all directions from the cornoa Deflected by the magnetic poles

19. Solar winds Approximate size of Earth for comparison

20. Auroras When the energy is released into the upper atmosphere of Earth they create auroras Also known as northern or southern lights

24. NASA matching sun activity

25. How are the images similar? Different?

26. The yellow UV images show regions of intense activity above the surface of the sun The black and white images show regions of magnetic connections break and reconnecting Many of these areas appear as sunspots in simple images of the sun

27. http://www.youtube.com/watch?v=PaSFAbATPvk