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A Nebula is a cloud filled with dust and gases that are pulled together from the force of gravity.
After millions of years, the dust and gases get pulled together causing a sphere filled with gases
The star then becomes a protostar and stays in this phase for millions of years call
After millions of years in its main sequence, the star expands and becomes a red giant.
The star then explodes and stays in this phase for millions of years
After the explosion, all the gases and particles from the exploding star are pulled together and they say in the white dwarf phase forever.
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