Stars explode near the end of their lives, where they swell to red giant stars once they run out of hydrogen in their cores. The star swells from nuclear fusion, which triggers in order to counteract the pressure from the overlying gas. Eventually, the star will explode in a supernova, leaving behind a white dwarf. It should be noted that nova are not the same as supernova, as nova are only flares upon the surface of the star.
Stars often explode because too much mass has been condensed too quickly. This happens near the end of a star’s lifetime after a great expansion under which everything soon collapses. Once this happens, it will either cool into a white dwarf or continue collapsing until it because a black hole. This only occurs under rare circumstances, however, with extraordinary amounts of mass.
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