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The beginning development of a star is marked by a supernova explosion, with the gases present in the nebula being forced .

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The beginning development of a star is marked by a supernova explosion, with the gases present in the nebula being forced to scatter. As the star shrinks, radiation of the surface increases and create pressure on the outside shell to push it away and forming a planetary nebula or white dwarf. 5.0. 3 votes.

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