This is about the life cycles of two types of stars
- Nebula
- the first stage in every stars life.
- Protostar
- the second stage in every stars life, gravity pulls gases and dust together and nuclear fusion starts
- Main sequence star
- the third stage in every stars life, the star is in it's middle age, around 6 billion years old. 90% opf a star's life is in this stage.
- Red giant
- The forth stage in a low mass star's life, after the star has used up all it's hydrogen, it starts to cool and expand in an effort to start fusing helium atoms.
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