2. Ch 6 : Our Sun: That Big Ball of Fire in Sky D Taylor ©2013, 2014, 2015

3. Notes: Keep an eye on calendar! – Updated. NEXT EXAM – NEXT WEEK – MUST be completed by Friday 11/06 HONORS Projects start after that – GROUP GRADES – Self-Eval

4. Introduction Birth (& Death…) of a M o star Stellar Evolution

5. Introduction Birth (& Death…) of a LARGE star Stellar Evolution

6. Introduction Star Formation Stellar Evolution

7. Details: Huge clump of space dust a few light years wide – Mostly just H, He and dust. Over a few Billion yrs, gravity clumps this stuff – Forms individual clumps. – Most of the time, one huge central clump forms The “outside” clumps can form planets Once central clump is large enough, gravity is strong enough to squish H’s together. Nuclear fusion begins.

8. Introduction – Star Formation – Virgo Nebula Stellar Evolution

9. Introduction – Star Formation – Virgo Nebula Stellar Evolution

10. Introduction – Main Sequence – Graph of stars lives Stellar Evolution

11. Introduction – Stellar Evolution

12. Introduction Main Sequence – Graph of stars lives Stellar Evolution

14. ProtoStar Non-fusing energy source at center of spinning – Flattens the central disc because of the ‘jets’ and NL3 Stellar Evolution

15. Age 4.57 Billion years (4.57x10 9 (  0.01) yr) Average Distance to Earth1.496 x 10 11 m (1 AU) Brightness-26.74 Rotational Period25.05 dd Rotational Velocity (Equator)7189 km/hr Orbital Radius (MW Center) Average Orbital Speed Orbital Period 2.7 x 10 17 km (27,200 ly) 220 km/s 2.25 x 10 8 yr Average Radius6.963 x 10 5 km (110 Earths) Mass1.989 × 10 30 kg (330,000 Earths) Average Density1408 kg/m 3 Surface Gravity274 m/s 2 (27.4 g)m/s 2g Temperatures Center Photosphere Corona 1.57 x 10 7 K (27 million o F) 5,778 K (9900 o F) 5 x 10 6 K Composition73.46% Hydrogen 24.85% Helium SOLAR DATA

16. Sun Structure

17. Balancing Act?

18. ProtoStar  Star Stellar Evolution

19. Here are the balanced nuclear equations that states the above in a summary: HONORS NECESSARY

20. Sun Magnetic Power

24. Umbra Penumbra Granules

25. Magnitude Crazy Magnitude System!