12. STAR FORMATION
1. Nebula forms from interstellar medium
2. Compression of nebula from supernova shock wave or passing galaxy
3. Gravity takes over, compresses nebula
4. Nebula compressed to absorption nebula (Bok globule) (Shrinks from size of Goodyear Blimp to grain of sand.)
5. Spin increases, nebula flattens into a disk
6. Nebula approaches main sequence on H-R diagram
7. Protostar forms, surrounded by disk of gas and dust
8. H-H Object forms
9. Nuclear fusion: protostar becomes a star
10. Outer gases blown away – planets form

13. Test of effect

14. Herbig Haro Object

15. H-H Obj

44. More massive star