When a star with an initial mass greater than about 8 solar masses nears the end of its life,it becomes a red supergiant and its energy comes from a series of concentric fusing shells.

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This is true. As a star with an initial mass greater than about 8 solar masses begins to exhaust the hydrogen in its core, it will begin to fuse helium and other elements in concentric shells surrounding the core. This process will continue until the star reaches iron in its core, at which point it will undergo a supernova explosion.

When a Star with an Initial Mass Greater Than About