1. Birth and Death of a Star and planetary systems Weve got the Hydrogen and Helium, now lets turn them on and let them Go!

2. Cosmic Abundances Hydrogen Hydrogen 80%80% Helium Helium 20%20% Lithium Lithium TraceTrace Beryllium Beryllium TraceTrace

3. All that gas Anything with mass has gravity Anything with mass has gravity Clumps of gas (the Big Bang wasnt exactly smooth) began to fall together Clumps of gas (the Big Bang wasnt exactly smooth) began to fall together

5. Dust and gas region – The Horsehead Nebula (in Orion) Dust and gas region – The Horsehead Nebula (in Orion)

6. Dust Clouds with stars forming inside Dust Clouds with stars forming inside

7. Dust around a star – a solar system forms Dust around a star – a solar system forms

9. Proto- planetary disks - stars forming planets Proto- planetary disks - stars forming planets In M42 In M42

13. The disk flattens, gas and dust comes together. The star is ON The disk flattens, gas and dust comes together. The star is ON

14. Star Birth behind dust – M42

15. Once they turn on, stars push the gas and dust away. Once they turn on, stars push the gas and dust away.

42. Same beginnings – different focus Same beginnings – different focus Lets do a short focus on the planetary system formation. Lets do a short focus on the planetary system formation. Well be discussing the planets in more depth later. Well be discussing the planets in more depth later.

48. The Condensation Sequence

52. Radar study of an asteroid going by. Radar study of an asteroid going by.