James Wadley Powerpoint for Astronomy 1040 Salt Lake Community College

1. The sun THE BEGINNING THROUGH THE END By: James Wadley

2. Outline – Stages of Sun’s Existence Molecular Cloud Proto-Sun Hydrogen Fusion Main Sequence Subgiant Red Giant Helium Burning Sun Double Shell Burning Red Giant Planetary Nebula White Dwarf Black Dwarf

4. Cloud fragmented into smaller pieces

5. Contracting gas quickly radiated most of the energy

7. Heat and pressure increased dramatically

8. Gravity and pressure caused contraction

9. Birth of our Proto-Sun

10. Surrounding gas continued to add mass

11. The more contraction the faster the rotation

12. Cloud flattened into a disk because of collisions

13. Angular momentum kept the disk spinning.0

16. The main sequence stage is around 10 billion years

17. Slight increase then decrease in temperature

18. Slow evolution during consumption of its hydrogen core

20. This will be a rapid growth cycle for about 600 million years

22. Core shrinks and heats

23. Hydrogen shell burning begins around the inert helium core

25. Core expands

26. Slows rate of hydrogen shell burning

28. Helium shell burning begins around the inert carbon core

29. Fusion in both hydrogen shell and helium shell

33. It is the temperature of the cosmic microwave background

35. The Sun will go through many stages and show many faces.