All stars have a life cycle.
Gravity pulls together DUST and GAS, this forms a PROTOSTAR.
The Stars MAIN SEQUENCE lasts billions of years. NUCLEAR FUSSION changes HYDROGEN TO HELLIUM, and heavier nuclei.
The star is stable due to forces being balanced within the star (inward gravitational forces match outward forces due to heat)
As Hydrogen fuel is used up, Nuclear fussion reactions change, The star expands becoming a RED GIANT
Nuclear fussion reactions change again, the inner core COLLAPSES. Star now becomes WHITE DWARF.
Nuclear Reactions form elements up to iron.
Nuclear fuels run out star cools and becomes BLACK DWARF!
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