4) Eventually the hydrogen begins to run out and the star swells into a RED GIANT. It becomes red because the surface cools.
5) A small star like our Sun will then begin to cool and contract into a WHITE DWARF and then finally as the light fades completely, it becomes a BLACK DWARF.
6) Big stars though start to glow brightly again as they undergo more fusion and expand and contract several times forming heavier elements in various nuclear reactions. Eventually they explode in a SUPERNOVA
7) The exploding supernova throws the outer layers of dust and gas into space, leaving a very dense core called a NEUTRON STAR, or if it's big enough a BLACK HOLE !!!!!!!!!!!!!!!!!!!
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