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\item Completely renewable  \end{itemize}  \subsubsection{Life Cycle of Stars}  \subsubsection{Heavyweight \subsubsection*{Heavyweight  Stars} \begin{itemize}  \item Layers of elements form in star, heaviest at centre  \item Fusion of heavy elements due to increased pressure from star  \item When iron nuclei in core fuse, energy is absorbed  \item An iron core will cause a supernova  \end{itemize}  \subsubsection*{Lightweight Stars}  \begin{itemize}  \item Longer life cycle than heavier stars  \item Will produce energy until all hydrogen is used  \item Expands into red giant after all energy is used  \item Red giant becomes unstable and outer gases drift away  \iem Collapses down to White Dwarf, 1\% of original stars size  \end{itemize}