stars

1. After all the hydrogen is burned up then the star starts burning Helium, fusing it into Carbon.
2. The outer envelope is thrown off into space.
3. When He runs out fusion stops and the core collapses.
4. It expands, becomes a giant again, and ejects all outer layers.
5. The compressed core that's left is C,N,O (White Dwarf).

1. A large cloud of cold gas and dust begins to be pulled together by its own gravity.
2. the cloud collapses.
3. If there is any net rotation it must be conserved (Conservation of Angular Momentum). This angular momentum will lead to the formation of a disk-like shape.
4. The central region of the disk will collapse to form the star.
5. The outer regions will condense to form planets.
6. A star becomes a star when the temperature and pressure are so high that thermonuclear fusion begins. This is how neutrinos are released.

1. Instead of turning into white dwarfs, these stars fuse C,N,O, creating heavier elements like Si and Iron.
2. The temperature drops suddenly and the core collapses in a fraction of a second.
3. The core rebounds causing a Supernova explosion.
4. Nucleosynthesis occurs creating heavy elements.
5. This is how material is made and put back into space.

Everything is made from the ashes of stars!