Stars Life Cycle
What are stars?
Stars are large, dense spheres of rock, dust and gases. They are extremely hot because they are constantly burning hydrogen fuel. There fuel doesn't last forever though, and when it runs out, something big happens.
After the big bang there was a lot of energy floating around. Chemical elements began forming, mostly hydrogen. They hydrogen condensed and started forming the star. Then nuclear fusion happend. The heavier elements started to appear, like carbon and oxygen. They all came together to form a star.
The middle of their life
The star is constantly burning.It has its own fuel, hydrogen. It will continue burning until the fuel runs out. on average a star can burn for billions of years. our sun has been burning for 5 billion years and its predicted to burn for 5 billion more.
In the end of a stars life, it burns hotter than it ever has. it uses up all its fuel and becomes a red giant. The heavier elements cause the star to begin caving in on its self. Eventually, the star will collaps under its own gravity causing a supernova.
The pieces of the star will travel through space and maybe become the start of a new star.