1. Star Formation

2. 1) Nebula  Cloud of interstellar gas and dust  Collapses due to its own gravity  Begins Star Formation

3. 2) Protostar  Rotating disk shape  Hot condensed object at the center  Fusion begins

4. 3) Main Sequence Star  Fusing Hydrogen into Helium  Longest phase of Sun’s Lifecycle

5. 4) Red Giant  Sun expands beyond Venus’ orbit

6. 5) Planetary Nebula  Outer layer of Star is driven off

7. 6) White Dwarf  No longer Nuclear  Supported by resistance of electrons being squeezed together

8. 7) Black Dwarf  Sun runs out of energy

9. Massive Stars 1) Nebula 2) Protostar 3) Main Sequence Star 4) Several Red Giant Phases Until iron has formed

11. Neutron Star  Extremely dense – 100 trillion times more dense than water  Very Small – a radius of approx. 10 km

12. Supernova  Massive explosion that blows off outer portion of neutron star http://www.youtube.com/watch?v=0J8srN24pSQ

13. Black Hole  Only the most massive stars (20 times the size of the Sun)  Collapse of star continues forever  Gravity so strong that light cannot escape http://www.youtube.com/watch?v=f_KLOFe2rDY