1. THE SUN

2. CLASSIFICATION OF THE SUN Class G Color Yellow Surface Temperature 5,000 – 6,000 ºC Elements hydrogen and helium Greek word for Sun is Helios

3. STRUCTURE OF THE SUN Atmosphere Corona Chromosphere Photosphere Interior Convective Zone Radiative zone Core

4. CORONA Sun’s outer atmosphere Can extend outward 10 – 12 times distance of the suns diameter Gases only visible during total solar eclipse 1,699,726.85 Celcius

7. CHROMOSPHERE 3,000 km thick Deep red in color Only seen during solar eclipse Element Helium was detected here in 1868 12,726.85 Celcius

11. PHOTOSPHERE Visible portion we see Gases thick to represent what we see as surface 600 km thick 5526.85 Celcius

13. CONVECTIVE ZONE 200,000 km thick Gases circulate in convection currents YouTube - Solar Convection Currents

14. RADIATIVE ZONE Dense region 300,000 km thick Takes light millions of years to pass through Atoms are densely packed

16. CORE Center of Sun Nuclear Fusion takes place here Radius of core = 200,000 km Temperature = 15,000,000

17. ENERGY PRODUCTION IN THE SUN Initial belief = Burning How can it burn for billions of years? Second thought = Shrinking Gravity causes sun to shrink releasing energy E=MC² Energy equals mass times the speed of light squared Nuclear fusion= process of two nuclei combining

18. NUCLEAR FUSION

19. FEATURES ON THE SUN Sunspots Prominence Solar flares Solar winds

20. SOLAR PROMINENCE

21. SOLAR FLARE

22. SUNSPOTS

23. SOLAR WINDS

24. AURORA BOREALIS

25. SIZE OF OUR STAR YouTube - Planets and stars size in scale